diff --git a/extensions/sdktools/vcaller.cpp b/extensions/sdktools/vcaller.cpp
index 3818d6c6..a6447463 100644
--- a/extensions/sdktools/vcaller.cpp
+++ b/extensions/sdktools/vcaller.cpp
@@ -401,6 +401,11 @@ static cell_t SDKCall(IPluginContext *pContext, const cell_t *params)
 				startparam++;
 			}
 			break;
+		default:
+			{
+				vc->stk_put(ptr);
+				return pContext->ThrowNativeError("Unrecognized SDK Call type (%d)", vc->type);
+			}
 		}
 	}