In this bug (https://cluster-fuzz.appspot.com/testcase?key=5804094059184128) on ClusterFuzz, the Suspected CL contains this stacktrace:

Exception while running FindIt:
Traceback (most recent call last):
File "/mnt/scratch0/clusterfuzz/src/tools/suspected_cl.py", line 194, in main
**keyword_args))
File "/mnt/scratch0/clusterfuzz/src/tools/findit/findit_for_clusterfuzz.py", line 349, in FindCulpritCLs
parsed_deps)
File "/mnt/scratch0/clusterfuzz/src/tools/findit/findit_for_crash.py", line 628, in FindItForCrash
failed_component = classify_utils.GetFailedComponentFromCallStack(callstack)
File "/mnt/scratch0/clusterfuzz/src/tools/findit/classify_utils.py", line 148, in GetFailedComponentFromCallStack
java_compare_func=JavaCallStackComponentCompareFunction)
File "/mnt/scratch0/clusterfuzz/src/tools/findit/classify_utils.py", line 128, in GetFailedComponentFromComponentList
top_n = TOP_N_FRAMES_FOR_CALLSTACK[language_type]
KeyError: None