diff --git a/csharp/ql/src/utils/modelgenerator/internal/CaptureModels.qll b/csharp/ql/src/utils/modelgenerator/internal/CaptureModels.qll
index f5fc49354be5..108c3f84d2c2 100644
--- a/csharp/ql/src/utils/modelgenerator/internal/CaptureModels.qll
+++ b/csharp/ql/src/utils/modelgenerator/internal/CaptureModels.qll
@@ -372,7 +372,7 @@ module ModelGeneratorInput implements ModelGeneratorInputSig<Location, CsharpDat
     or
     i = 4 and ExternalFlow::partialModel(api, _, _, _, _, result) // parameters
     or
-    i = 5 and result = "" // ext
+    i = 5 and result = "" and exists(api) // ext
   }
 
   string partialNeutralModelRow(Callable api, int i) {
diff --git a/java/ql/src/utils/modelgenerator/internal/CaptureModels.qll b/java/ql/src/utils/modelgenerator/internal/CaptureModels.qll
index 113e9bd2c2f8..1f96d8ad296d 100644
--- a/java/ql/src/utils/modelgenerator/internal/CaptureModels.qll
+++ b/java/ql/src/utils/modelgenerator/internal/CaptureModels.qll
@@ -293,7 +293,7 @@ module ModelGeneratorInput implements ModelGeneratorInputSig<Location, JavaDataF
     or
     i = 4 and result = ExternalFlow::paramsString(api) // parameters
     or
-    i = 5 and result = "" // ext
+    i = 5 and result = "" and exists(api) // ext
   }
 
   string partialNeutralModelRow(Callable api, int i) {