diff --git a/compiler/erg_compiler/hir.rs b/compiler/erg_compiler/hir.rs
index eb6f22c5..c039aed8 100644
--- a/compiler/erg_compiler/hir.rs
+++ b/compiler/erg_compiler/hir.rs
@@ -1610,7 +1610,7 @@ impl Locational for Params {
         } else if !self.defaults.is_empty() {
             Location::concat(&self.defaults[0], self.defaults.last().unwrap())
         } else {
-            panic!()
+            Location::Unknown
         }
     }
 }
diff --git a/compiler/erg_parser/ast.rs b/compiler/erg_parser/ast.rs
index 99fcf5e8..013a97bc 100644
--- a/compiler/erg_parser/ast.rs
+++ b/compiler/erg_parser/ast.rs
@@ -2959,7 +2959,7 @@ impl Locational for Params {
         } else if !self.defaults.is_empty() {
             Location::concat(&self.defaults[0], self.defaults.last().unwrap())
         } else {
-            panic!()
+            Location::Unknown
         }
     }
 }