diff --git a/ui/src/data-services/models/occurrence-details.ts b/ui/src/data-services/models/occurrence-details.ts
index 90654984f..797eb75e3 100644
--- a/ui/src/data-services/models/occurrence-details.ts
+++ b/ui/src/data-services/models/occurrence-details.ts
@@ -56,7 +56,8 @@ export class OccurrenceDetails extends Occurrence {
       .map((i: any) => {
         const taxon = new Taxon(i.taxon)
         const overridden = i.withdrawn
-        const applied = taxon.id === this.determinationTaxon.id
+        const applied =
+          !!this.determinationTaxon && taxon.id === this.determinationTaxon.id
 
         const identification: HumanIdentification = {
           id: `${i.id}`,
@@ -82,8 +83,10 @@ export class OccurrenceDetails extends Occurrence {
       .sort(sortByDate)
       .map((p: any) => {
         const taxon = new Taxon(p.taxon)
-        const overridden = taxon.id !== this.determinationTaxon.id
-        const applied = taxon.id === this.determinationTaxon.id
+        const overridden =
+          !this.determinationTaxon || taxon.id !== this.determinationTaxon.id
+        const applied =
+          !!this.determinationTaxon && taxon.id === this.determinationTaxon.id
 
         const prediction: MachinePrediction = {
           id: `${p.id}`,
diff --git a/ui/src/data-services/models/occurrence.ts b/ui/src/data-services/models/occurrence.ts
index 8482c5bc9..40b31c814 100644
--- a/ui/src/data-services/models/occurrence.ts
+++ b/ui/src/data-services/models/occurrence.ts
@@ -8,13 +8,15 @@ export type ServerOccurrence = any // TODO: Update this type
 
 export class Occurrence {
   protected readonly _occurrence: ServerOccurrence
-  private readonly _determinationTaxon: Taxon
+  private readonly _determinationTaxon: Taxon | undefined
   private readonly _images: { src: string }[] = []
 
   public constructor(occurrence: ServerOccurrence) {
     this._occurrence = occurrence
 
-    this._determinationTaxon = new Taxon(occurrence.determination_details.taxon)
+    this._determinationTaxon = occurrence.determination_details?.taxon
+      ? new Taxon(occurrence.determination_details.taxon)
+      : undefined
 
     this._images = occurrence.detection_images
       .filter((src: string) => !!src.length)
@@ -49,8 +51,10 @@ export class Occurrence {
     return this._occurrence.deployment?.name
   }
 
-  get determinationId(): string {
-    return `${this._occurrence.determination.id}`
+  get determinationId(): string | undefined {
+    return this._occurrence.determination
+      ? `${this._occurrence.determination.id}`
+      : undefined
   }
 
   get determinationIdentificationId(): string | undefined {
@@ -70,7 +74,7 @@ export class Occurrence {
   }
 
   get determinationScore(): number | undefined {
-    const score = this._occurrence.determination_details.score
+    const score = this._occurrence.determination_details?.score
 
     if (score || score === 0) {
       return score
@@ -89,17 +93,17 @@ export class Occurrence {
     return undefined
   }
 
-  get determinationTaxon(): Taxon {
+  get determinationTaxon(): Taxon | undefined {
     return this._determinationTaxon
   }
 
   get determinationVerified(): boolean {
-    return !!this._occurrence.determination_details.identification
+    return !!this._occurrence.determination_details?.identification
   }
 
   get determinationVerifiedBy() {
     const verifiedBy =
-      this._occurrence.determination_details.identification?.user
+      this._occurrence.determination_details?.identification?.user
 
     return verifiedBy
       ? {
@@ -116,7 +120,8 @@ export class Occurrence {
   }
 
   get displayName(): string {
-    return `${this.determinationTaxon.name} #${this.id}`
+    const name = this.determinationTaxon?.name ?? 'Unknown'
+    return `${name} #${this.id}`
   }
 
   get firstAppearanceTimestamp(): string {
@@ -180,6 +185,10 @@ export class Occurrence {
         return false
       }
 
+      if (!this.determinationTaxon) {
+        return false
+      }
+
       return (
         identificationTaxonId === this.determinationTaxon.id &&
         identificationUserId === userId
diff --git a/ui/src/pages/occurrence-details/identification-card/machine-prediction.tsx b/ui/src/pages/occurrence-details/identification-card/machine-prediction.tsx
index 11a1d824c..7f14c6e1c 100644
--- a/ui/src/pages/occurrence-details/identification-card/machine-prediction.tsx
+++ b/ui/src/pages/occurrence-details/identification-card/machine-prediction.tsx
@@ -111,7 +111,9 @@ export const MachinePrediction = ({
               isLoading={isLoading}
             />
             {topN?.map(({ score, taxon }) => {
-              const applied = taxon.id === occurrence.determinationTaxon.id
+              const applied =
+                !!occurrence.determinationTaxon &&
+                taxon.id === occurrence.determinationTaxon.id
 
               return (
                 <MachinePredictionDetails
diff --git a/ui/src/pages/occurrence-details/occurrence-details.tsx b/ui/src/pages/occurrence-details/occurrence-details.tsx
index 7ec5355ab..c245aadf1 100644
--- a/ui/src/pages/occurrence-details/occurrence-details.tsx
+++ b/ui/src/pages/occurrence-details/occurrence-details.tsx
@@ -136,20 +136,26 @@ export const OccurrenceDetails = ({
         <meta name="og:image" content={occurrence.images[0]?.src} />
       </Helmet>
       <div className={styles.header}>
-        <TaxonDetails
-          onTaxonClick={(id) =>
-            navigate(
-              getAppRoute({
-                to: APP_ROUTES.TAXON_DETAILS({
-                  projectId: projectId as string,
-                  taxonId: id,
-                }),
-              })
-            )
-          }
-          size="lg"
-          taxon={occurrence.determinationTaxon}
-        />
+        {occurrence.determinationTaxon ? (
+          <TaxonDetails
+            onTaxonClick={(id) =>
+              navigate(
+                getAppRoute({
+                  to: APP_ROUTES.TAXON_DETAILS({
+                    projectId: projectId as string,
+                    taxonId: id,
+                  }),
+                })
+              )
+            }
+            size="lg"
+            taxon={occurrence.determinationTaxon}
+          />
+        ) : (
+          <span className="body-lg font-medium text-muted">
+            {translate(STRING.UNKNOWN)}
+          </span>
+        )}
         <div className={styles.taxonActions}>
           {occurrence.determinationScore !== undefined ? (
             <BasicTooltip
@@ -169,7 +175,7 @@ export const OccurrenceDetails = ({
               />
             </BasicTooltip>
           ) : null}
-          {canUpdate && (
+          {canUpdate && occurrence.determinationTaxon && (
             <>
               <Agree
                 agreed={userInfo ? occurrence.userAgreed(userInfo.id) : false}
diff --git a/ui/src/pages/occurrences/occurrence-actions.tsx b/ui/src/pages/occurrences/occurrence-actions.tsx
index d574cdadc..2abec64a7 100644
--- a/ui/src/pages/occurrences/occurrence-actions.tsx
+++ b/ui/src/pages/occurrences/occurrence-actions.tsx
@@ -1,6 +1,7 @@
 import { IdentificationFieldValues } from 'data-services/hooks/identifications/types'
 import { useCreateIdentifications } from 'data-services/hooks/identifications/useCreateIdentifications'
 import { Occurrence } from 'data-services/models/occurrence'
+import { Taxon } from 'data-services/models/taxa'
 import { BasicTooltip } from 'design-system/components/tooltip/basic-tooltip'
 import { AlertCircleIcon, CheckIcon, Loader2Icon } from 'lucide-react'
 import { Button } from 'nova-ui-kit'
@@ -40,9 +41,9 @@ export const OccurrenceActions = ({
       />
       <IdQuickActions
         occurrenceIds={occurrences.map((occurrence) => occurrence.id)}
-        occurrenceTaxa={occurrences.map(
-          (occurrence) => occurrence.determinationTaxon
-        )}
+        occurrenceTaxa={occurrences
+          .map((occurrence) => occurrence.determinationTaxon)
+          .filter((taxon): taxon is Taxon => !!taxon)}
       />
     </div>
   )
@@ -69,13 +70,14 @@ const Agree = ({
 
           return !agreed
         })
+        .filter((occurrence) => !!occurrence.determinationTaxon)
         .map((occurrence) => ({
           agreeWith: {
             identificationId: occurrence.determinationIdentificationId,
             predictionId: occurrence.determinationPredictionId,
           },
           occurrenceId: occurrence.id,
-          taxonId: occurrence.determinationTaxon.id,
+          taxonId: occurrence.determinationTaxon!.id,
         })),
     [occurrences]
   )
diff --git a/ui/src/pages/occurrences/occurrence-columns.tsx b/ui/src/pages/occurrences/occurrence-columns.tsx
index fc98d9b1a..eebe136d4 100644
--- a/ui/src/pages/occurrences/occurrence-columns.tsx
+++ b/ui/src/pages/occurrences/occurrence-columns.tsx
@@ -195,9 +195,15 @@ const TaxonCell = ({
       <BasicTableCell style={{ minWidth: '320px' }}>
         <div className={styles.taxonCellContent}>
           <Link to={detailsRoute}>
-            <TaxonDetails compact taxon={item.determinationTaxon} />
+            {item.determinationTaxon ? (
+              <TaxonDetails compact taxon={item.determinationTaxon} />
+            ) : (
+              <span className="body-base text-muted">
+                {translate(STRING.UNKNOWN)}
+              </span>
+            )}
           </Link>
-          {showQuickActions && canUpdate && (
+          {showQuickActions && canUpdate && item.determinationTaxon && (
             <div className={styles.taxonActions}>
               <Agree
                 agreed={agreed}
diff --git a/ui/src/pages/occurrences/occurrence-gallery.tsx b/ui/src/pages/occurrences/occurrence-gallery.tsx
index 88c954631..bbb64cfdc 100644
--- a/ui/src/pages/occurrences/occurrence-gallery.tsx
+++ b/ui/src/pages/occurrences/occurrence-gallery.tsx
@@ -20,10 +20,10 @@ import { STRING, translate } from 'utils/language'
 import { UserPermission } from 'utils/user/types'
 import { useUserInfo } from 'utils/user/userInfoContext'
 
-export const isGenusOrBelow = (taxon: Taxon) =>
-  taxon.rank === 'GENUS' ||
-  taxon.rank === 'SPECIES' ||
-  taxon.rank === 'SUBSPECIES'
+export const isGenusOrBelow = (taxon?: Taxon) =>
+  taxon?.rank === 'GENUS' ||
+  taxon?.rank === 'SPECIES' ||
+  taxon?.rank === 'SUBSPECIES'
 
 export const OccurrenceGallery = ({
   error,
@@ -158,7 +158,8 @@ export const OccurrenceGallery = ({
                         }
                       )}
                     >
-                      {item.determinationTaxon.name}
+                      {item.determinationTaxon?.name ??
+                        translate(STRING.UNKNOWN)}
                     </span>
                   </Link>
                 </div>
@@ -181,7 +182,7 @@ export const OccurrenceGallery = ({
                       />
                     </BasicTooltip>
                   ) : null}
-                  {!isSelecting && canUpdate && (
+                  {!isSelecting && canUpdate && item.determinationTaxon && (
                     <>
                       <Agree
                         agreed={agreed}