diff --git a/.github/workflows/pyinstaller-windows.yml b/.github/workflows/pyinstaller-windows.yml
index 01d22c2..48b176d 100644
--- a/.github/workflows/pyinstaller-windows.yml
+++ b/.github/workflows/pyinstaller-windows.yml
@@ -52,7 +52,7 @@ jobs:
         run:  python -m PyInstaller jamstats.spec
  
       - name: Upload Artifact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: jamstats-${{ runner.os }}   
           path: src/dist/jamstats.exe
diff --git a/resources/jamstats_version.txt b/resources/jamstats_version.txt
index 323afbc..0d697e4 100644
--- a/resources/jamstats_version.txt
+++ b/resources/jamstats_version.txt
@@ -1 +1 @@
-1.4.14
+3.4.15
diff --git a/setup.py b/setup.py
index 5296965..777d75b 100644
--- a/setup.py
+++ b/setup.py
@@ -2,7 +2,7 @@
 
 setup(
     name='jamstats',
-    version='3.4.14',
+    version='3.4.15',
     description='Data processing, stats and plots on roller derby scoreboard JSON files',
     author='Damon May',
     package_dir={"":"src"},
diff --git a/setup_nogui.py b/setup_nogui.py
index 57e45b2..d80a9ab 100644
--- a/setup_nogui.py
+++ b/setup_nogui.py
@@ -2,7 +2,7 @@
 
 setup(
     name='jamstats-nogui',
-    version='3.4.14',
+    version='3.4.15',
     description='Data processing, stats and plots on roller derby scoreboard JSON files. No-GUI version.',
     author='Damon May',
     package_dir={"":"src"},
diff --git a/src/jamstats/data/json_to_pandas.py b/src/jamstats/data/json_to_pandas.py
index c4428cf..632db49 100644
--- a/src/jamstats/data/json_to_pandas.py
+++ b/src/jamstats/data/json_to_pandas.py
@@ -77,7 +77,7 @@ def json_to_game_dataframe(game_json: Dict[Any, Any]) -> pd.DataFrame:
         # annotated with a game identifier. Complete games don't have
         # "CurrentGame" fields. So, if we find a "CurrentGame" field,
         # use those and strip out all the fields with a game identifier.
-        logger.debug(f"Found version 5. Checking for in-progress game...")
+        logger.debug(f"Found version 5 or later. Checking for in-progress game...")
         is_in_progress_game = False
         for key in game_dict:
             if ".CurrentGame." in key:
@@ -127,10 +127,12 @@ def get_json_major_version(game_dict: Dict[str, Any]) -> str:
         int: major version
     """
     version_str = get_json_version(game_dict)
+    logger.debug(f"JSON version string: {version_str}")
     major_version = version_str.split(".")[0]
-    assert(major_version.startswith("v"))
+    if major_version.startswith("v"):
+        major_version = major_version[1:]
     logger.debug(f"JSON major version string: {major_version}")
-    return major_version[1:]
+    return major_version
 
 
 def get_json_version(game_dict: Dict[str, Any]) -> str:
@@ -157,8 +159,9 @@ def get_json_major_version_from_pdf(pdf_game_data: pd.DataFrame) -> str:
     version_str = list(
         pdf_game_data[pdf_game_data.key == "ScoreBoard.Version(release)"].value)[0]
     major_version = version_str.split(".")[0]
-    assert(major_version.startswith("v"))
-    return major_version[1:]
+    if major_version.startswith("v"):
+        major_version = major_version[1:]
+    return major_version
 
 
 def extract_game_data_dict(pdf_game_state: pd.DataFrame) -> Dict[str, Any]:
@@ -443,7 +446,6 @@ def extract_roster(pdf_game_state: pd.DataFrame,
     else:
         team_string_1 = f"Team\\(1\\)"
         team_string_2 = f"Team\\(2\\)"
-    
     team_string_1 = cleanup_team_name(team_string_1)
     team_string_2 = cleanup_team_name(team_string_2)
 
@@ -494,10 +496,20 @@ def extract_roster(pdf_game_state: pd.DataFrame,
     # paranoia. Somehow a quadmedia game had no Id column, so if that happens
     # write out a message
     if "Id" not in pdf_roster.columns:
-        error_message = "No Id column in roster. This is a bug in the game file."
+        error_message = "No Id column in roster. This is a bug in the game file.\n"
         error_message += "Roster columns: " + str(pdf_roster.columns)
+        error_message += "\nDummying empty roster"
         logger.error(error_message)
-        raise ValueError(error_message)
+        pdf_roster = pd.DataFrame({
+            "Id": pd.Series(dtype="str"),
+            "Name": pd.Series(dtype="str"),
+            "RosterNumber": pd.Series(dtype="str"),
+            "Number": pd.Series(dtype="str"),
+            "team": pd.Series(dtype="str"),
+            "Pronouns": pd.Series(dtype="str"),
+        })
+        print(pdf_roster)
+
     pdf_roster = pdf_roster[pdf_roster.Id.notnull()]
     logger.debug("After dropping nulls, length: " + str(len(pdf_roster)))
 
@@ -779,6 +791,8 @@ def extract_penalties(pdf_game_state: pd.DataFrame,
     # cast is necessary if there are no penalties yet
     pdf_penalties = pdf_penalties.astype({"prd_jam": str})
     pdf_penalties = pdf_penalties.rename(columns={"Code": "penalty_code"})
+    if len(pdf_penalties) == 0:
+        pdf_penalties["Id"] = pdf_penalties.Id.astype(str)
 
     logger.debug(f"    Before merging with roster: {len(pdf_penalties)}")
     rosternumber_col = "RosterNumber" if "RosterNumber" in pdf_roster else "Number"
diff --git a/src/jamstats/resources/jamstats_version.txt b/src/jamstats/resources/jamstats_version.txt
index 323afbc..0d697e4 100644
--- a/src/jamstats/resources/jamstats_version.txt
+++ b/src/jamstats/resources/jamstats_version.txt
@@ -1 +1 @@
-1.4.14
+3.4.15