diff --git a/src/application/Parser/Script/Compiler/Function/SharedFunctionsParser.ts b/src/application/Parser/Script/Compiler/Function/SharedFunctionsParser.ts
index 60f8d425..9cdb4173 100644
--- a/src/application/Parser/Script/Compiler/Function/SharedFunctionsParser.ts
+++ b/src/application/Parser/Script/Compiler/Function/SharedFunctionsParser.ts
@@ -98,6 +98,7 @@ function hasCall(data: FunctionData): data is CallFunctionData {
 }
 
 function ensureValidFunctions(functions: readonly FunctionData[]) {
+  ensureNoUnnamedFunctions(functions);
   ensureNoDuplicatesInFunctionNames(functions);
   ensureEitherCallOrCodeIsDefined(functions);
   ensureNoDuplicateCode(functions);
@@ -108,6 +109,16 @@ function printList(list: readonly string[]): string {
   return `"${list.join('","')}"`;
 }
 
+function ensureNoUnnamedFunctions(functions: readonly FunctionData[]) {
+  const functionsWithoutNames = functions.filter(
+    (func) => !func.name || func.name.trim().length === 0,
+  );
+  if (functionsWithoutNames.length) {
+    const invalidFunctions = functionsWithoutNames.map((f) => JSON.stringify(f));
+    throw new Error(`Some function(s) have no names:\n${invalidFunctions.join('\n')}`);
+  }
+}
+
 function ensureEitherCallOrCodeIsDefined(holders: readonly FunctionData[]) {
   // Ensure functions do not define both call and code
   const withBothCallAndCode = holders.filter((holder) => hasCode(holder) && hasCall(holder));
diff --git a/tests/unit/application/Parser/Script/Compiler/Function/SharedFunctionsParser.spec.ts b/tests/unit/application/Parser/Script/Compiler/Function/SharedFunctionsParser.spec.ts
index 47616539..29426618 100644
--- a/tests/unit/application/Parser/Script/Compiler/Function/SharedFunctionsParser.spec.ts
+++ b/tests/unit/application/Parser/Script/Compiler/Function/SharedFunctionsParser.spec.ts
@@ -26,6 +26,27 @@ describe('SharedFunctionsParser', () => {
   });
   describe('parseFunctions', () => {
     describe('validates functions', () => {
+      it('throws when functions have no names', () => {
+        // arrange
+        const invalidFunctions = [
+          createFunctionDataWithCode()
+            .withCode('test function 1')
+            .withName(' '), // Whitespace,
+          createFunctionDataWithCode()
+            .withCode('test function 2')
+            .withName(undefined as unknown as string), // Undefined
+          createFunctionDataWithCode()
+            .withCode('test function 3')
+            .withName(''), // Empty
+        ];
+        const expectedError = `Some function(s) have no names:\n${invalidFunctions.map((f) => JSON.stringify(f)).join('\n')}`;
+        // act
+        const act = () => new ParseFunctionsCallerWithDefaults()
+          .withFunctions(invalidFunctions)
+          .parseFunctions();
+        // assert
+        expect(act).to.throw(expectedError);
+      });
       it('throws when functions have same names', () => {
         // arrange
         const name = 'same-func-name';