diff --git a/interop/src/cpp/jni/convertors-jni.cc b/interop/src/cpp/jni/convertors-jni.cc
index 7e7addf7d81d3cccdf9cabcdf668a5f6f00b30c4..683625b09e9e7cac39905f70d84ee8f2c7ddbd45 100644
--- a/interop/src/cpp/jni/convertors-jni.cc
+++ b/interop/src/cpp/jni/convertors-jni.cc
@@ -14,10 +14,11 @@
  */
 
 
-#define KOALA_INTEROP_MODULE 
+#define KOALA_INTEROP_MODULE
 #include "convertors-jni.h"
 #include "signatures.h"
 #include "interop-logging.h"
+#include "interop-types.h"
 
 static const char* nativeModule = "org/koalaui/arkoala/InteropNativeModule";
 static const char* nativeModulePrefix = "org/koalaui/arkoala/";
@@ -92,7 +93,7 @@ const std::vector<std::tuple<std::string, std::string, void*>>& JniExports::getM
     auto it = implementations.find(module);
     if (it == implementations.end()) {
         LOGE("Module %s is not registered", module.c_str());
-        throw "Fatal error";
+        INTEROP_FATAL("Fatal error: not registered module %s", module.c_str());
     }
     return it->second;
 }
diff --git a/interop/src/cpp/jni/convertors-jni.h b/interop/src/cpp/jni/convertors-jni.h
index 469fb9686c200eb985bee207cb573aa3a006141b..0ff5fd07d8ee193466a87bdc98379de8af6a9e25 100644
--- a/interop/src/cpp/jni/convertors-jni.h
+++ b/interop/src/cpp/jni/convertors-jni.h
@@ -300,9 +300,7 @@ struct InteropTypeConverter<KLength> {
 
         return result;
     }
-    static InteropType convertTo(JNIEnv* env, KLength value) {
-        throw "InteropTypeConverter<KLength>::convertTo not implemented yet";
-    }
+    static InteropType convertTo(JNIEnv* env, KLength value) = delete;
     static inline void release(JNIEnv* env, InteropType value, KLength converted) {}
 };