1 files changed, 2 insertions, 0 deletions
diff --git a/clang/lib/AST/ASTContext.cpp b/clang/lib/AST/ASTContext.cpp
index 916e7d796fb..248698f45a1 100644
--- a/clang/lib/AST/ASTContext.cpp
+++ b/clang/lib/AST/ASTContext.cpp
@@ -4149,6 +4149,8 @@ std::string ASTContext::getObjCEncodingForBlock(const BlockExpr *Expr) const {
        E = Decl->param_end(); PI != E; ++PI) {
     QualType PType = (*PI)->getType();
     CharUnits sz = getObjCEncodingTypeSize(PType);
+    if (sz.isZero())
+      continue;
     assert (sz.isPositive() && "BlockExpr - Incomplete param type");
     ParmOffset += sz;
   }