diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1bebe73b..31974469 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+# 2.4.12 (2020-12-03)
+- fix #373: missing schemaprocessor implementation
+
 # 2.4.11 (2020-12-03)
 - fix #373: add support for array items with different schema definitions
 
diff --git a/projects/schema-form/package.json b/projects/schema-form/package.json
index adc88b1d..f96ab00f 100644
--- a/projects/schema-form/package.json
+++ b/projects/schema-form/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ngx-schema-form",
-  "version": "2.4.11",
+  "version": "2.4.12",
   "repository": {
     "type": "git",
     "url": "git+https://github.com/guillotinaweb/ngx-schema-form"
diff --git a/projects/schema-form/src/lib/model/schemapreprocessor.ts b/projects/schema-form/src/lib/model/schemapreprocessor.ts
index 3cbe28f0..cb842ab4 100644
--- a/projects/schema-form/src/lib/model/schemapreprocessor.ts
+++ b/projects/schema-form/src/lib/model/schemapreprocessor.ts
@@ -134,7 +134,16 @@ export class SchemaPreprocessor {
         }
       }
     } else if (jsonSchema.type === 'array') {
-      SchemaPreprocessor.preprocess(jsonSchema.items, path + '*/');
+      if (Array.isArray(jsonSchema.items || {})) {
+        for (let i = 0; i < jsonSchema.items.length; i++) {
+          SchemaPreprocessor.preprocess(jsonSchema.items[i], path + '*/');
+        }
+      } else {
+        SchemaPreprocessor.preprocess(jsonSchema.items, path + '*/');
+      }
+      if (jsonSchema.additionalItems) {
+        SchemaPreprocessor.preprocess(jsonSchema.additionalItems, path + '*/');
+      }
     }
   }