diff --git a/projectmanagers/cmake/duchain/declarationbuilder.cpp b/projectmanagers/cmake/duchain/declarationbuilder.cpp
--- a/projectmanagers/cmake/duchain/declarationbuilder.cpp
+++ b/projectmanagers/cmake/duchain/declarationbuilder.cpp
@@ -31,13 +31,19 @@
         const CMakeFunctionDesc& func = node->next();
 
         if (func.name == "add_executable" || func.name == "add_library") {
+            if (func.arguments.isEmpty()) {
+                continue;
+            }
             CMakeFunctionArgument arg = func.arguments.first();
 
             DUChainWriteLocker lock;
             Declaration* decl = openDeclaration<Declaration>(QualifiedIdentifier(arg.value), arg.range(), DeclarationIsDefinition);
             decl->setAbstractType(AbstractType::Ptr(new TargetType));
             closeDeclaration();
         } else if(func.name == "macro" || func.name == "function") {
+            if (func.arguments.isEmpty()) {
+                continue;
+            }
             CMakeFunctionArgument arg = func.arguments.first();
             FunctionType::Ptr funcType(new FunctionType);