Fix error in 3.12 during Pytest

doc/CHANGELOG.rst

@@ -6,6 +6,7 @@ This changelog *only* contains changes from the *first* pypi release (0.5.4.3) o
 Latest Changes:
 
 - **1.5.1_dev0 - 2023-12-15**
+  - Fixed uncaught exception while setting traceback causing issues in Python 3.11/3.12.
   - Use PEP-518 and PEP-660 configuration for the package, allowing editable and
     configurable builds using modern Python packaging tooling.
     Where before ``python setup.py --enable-tracing develop``, now can be done with

native/python/pyjp_object.cpp

@@ -390,7 +390,8 @@ void PyJPException_normalize(JPJavaFrame frame, JPPyObject exc, jthrowable th, j
 	{
 		// Attach the frame to first
 		JPPyObject trace = PyTrace_FromJavaException(frame, th, enclosing);
-		PyException_SetTraceback(exc.get(), trace.get());
+		if (trace.get()!=nullptr)
+			PyException_SetTraceback(exc.get(), trace.get());
 
 		// Check for the next in the cause list
 		enclosing = th;