diff --git a/bp2build/build_conversion.go b/bp2build/build_conversion.go
index 7a73e18..388c8cf 100644
--- a/bp2build/build_conversion.go
+++ b/bp2build/build_conversion.go
@@ -568,6 +568,9 @@
 			return true
 		}
 	default:
+		if !value.IsValid() {
+			return true
+		}
 		zeroValue := reflect.Zero(value.Type())
 		result := value.Interface() == zeroValue.Interface()
 		return result