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-rw-r--r--source/slang/slang-emit-cpp.cpp5
1 files changed, 4 insertions, 1 deletions
diff --git a/source/slang/slang-emit-cpp.cpp b/source/slang/slang-emit-cpp.cpp
index b0d1fbb4c..13a85e8ab 100644
--- a/source/slang/slang-emit-cpp.cpp
+++ b/source/slang/slang-emit-cpp.cpp
@@ -614,7 +614,10 @@ void CPPSourceEmitter::emitGlobalRTTISymbolPrefix()
void CPPSourceEmitter::emitWitnessTable(IRWitnessTable* witnessTable)
{
- auto interfaceType = cast<IRInterfaceType>(witnessTable->getConformanceType());
+ auto interfaceType = as<IRInterfaceType>(witnessTable->getConformanceType());
+
+ if (!interfaceType)
+ return;
// Ignore witness tables for builtin interface types.
if (isBuiltin(interfaceType))