1 files changed, 3 insertions, 2 deletions
diff --git a/ast.cpp b/ast.cpp
index d23ff0d..e3a3e68 100644
--- a/ast.cpp
+++ b/ast.cpp
@@ -80,8 +80,9 @@ AST::Value AST::ProcedureCall::codegen(CompilerState& state)
             std::vector<llvm::Type *> argtypes;
 
             for (auto& a : operands) {
-                args.push_back(a->codegen(state));
-                argtypes.push_back(args.back()->getType());
+                auto gen = a->codegen(state);
+                args.push_back(gen);
+                argtypes.push_back(gen ? gen->getType() : llvm::Type::getVoidTy(state.context));
             }