Fix crash in ExceptionUtils.getLineno on continuation frames

Author: msimacek

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/runtime/exception/ExceptionUtils.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018, 2025, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2018, 2026, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * The Universal Permissive License (UPL), Version 1.0
@@ -136,6 +136,9 @@ private static int getLineno(Frame frame, Node location, FrameInstance frameInst
                 }
 
                 if (bytecodeNode != null) {
+                    if (PGenerator.isGeneratorFrame(frame)) {
+                        frame = PGenerator.getGeneratorFrame(frame);
+                    }
                     int bci = bytecodeNode.getBytecodeIndex(frame);
                     SourceSection sourceLocation = bytecodeNode.getBytecodeLocation(bci).getSourceLocation();
                     if (sourceLocation != null) {