src/jdk.internal.vm.compiler/share/classes/org.graalvm.graphio/src/org/graalvm/graphio/GraphProtocol.java

*** 525,535 ****
              ResolvedJavaMethod method = findNodeSourcePositionMethod(pos);
              writePoolObject(method);
              final int bci = findNodeSourcePositionBCI(pos);
              writeInt(bci);
              StackTraceElement ste = findMethodStackTraceElement(method, bci, pos);
!             if (ste != null) {
                  writePoolObject(ste.getFileName());
                  writeInt(ste.getLineNumber());
              } else {
                  writePoolObject(null);
              }
--- 525,535 ----
              ResolvedJavaMethod method = findNodeSourcePositionMethod(pos);
              writePoolObject(method);
              final int bci = findNodeSourcePositionBCI(pos);
              writeInt(bci);
              StackTraceElement ste = findMethodStackTraceElement(method, bci, pos);
!             if (ste != null && ste.getFileName() != null) {
                  writePoolObject(ste.getFileName());
                  writeInt(ste.getLineNumber());
              } else {
                  writePoolObject(null);
              }