diff --git a/source/restore-symbol.m b/source/restore-symbol.m
index 3dae5fc..47b84ba 100644
--- a/source/restore-symbol.m
+++ b/source/restore-symbol.m
@@ -177,13 +177,14 @@ void restore_symbol(NSString * inpath, NSString *outpath, NSString *jsonPath, bo
             }
         }
         
-        struct linkedit_data_command *command = (struct linkedit_data_command *)((char *)outData.mutableBytes + codesignature.commandOffset);
-        uint32_t tmp_offset =  command -> dataoff + increase_size_all_without_padding;
-        uint32_t final_offset = vm_addr_round(tmp_offset, 16);
-        
-        string_table_padding = final_offset - tmp_offset;
-        command -> dataoff = final_offset;
-        
+        if (codesignature) {
+            struct linkedit_data_command *command = (struct linkedit_data_command *)((char *)outData.mutableBytes + codesignature.commandOffset);
+            uint32_t tmp_offset =  command -> dataoff + increase_size_all_without_padding;
+            uint32_t final_offset = vm_addr_round(tmp_offset, 16);
+            
+            string_table_padding = final_offset - tmp_offset;
+            command -> dataoff = final_offset;
+        }
     }