diff --git a/model.cpp b/model.cpp
index 6bb8de1e2ab207663eec8a819065cee38b2e0c46..9a764f31c7206df82507d06b8792b4282acf1c7f 100644
--- a/model.cpp
+++ b/model.cpp
@@ -125,7 +125,8 @@ Componant *Model::processBracket(std::string& str, size_t paramSweepCount, bool
 						break;
 					}
 					default:
-						break;
+						Log(Log::DEBUG)<<"Invalid char "<<nodeStr[i]<<" in model string";
+						return nullptr;
 				}
 			}
 		}