1 files changed, 2 insertions, 0 deletions

diff --git a/bitbake/lib/bb/parse/ast.py b/bitbake/lib/bb/parse/ast.py
index d7185b1664..fa83b18981 100644
--- a/bitbake/lib/bb/parse/ast.py
+++ b/bitbake/lib/bb/parse/ast.py
@@ -344,6 +344,8 @@ def finalize(fn, d, variant = None):
     for var in d.getVar('__BBHANDLERS', False) or []:
         # try to add the handler
         handlerfn = d.getVarFlag(var, "filename", False)
+        if not handlerfn:
+            bb.fatal("Undefined event handler function '%s'" % var)
         handlerln = int(d.getVarFlag(var, "lineno", False))
         bb.event.register(var, d.getVar(var, False), (d.getVarFlag(var, "eventmask", True) or "").split(), handlerfn, handlerln)