diff --git a/metagpt/utils/repair_llm_raw_output.py b/metagpt/utils/repair_llm_raw_output.py
index 0b521a7b0..f9e6d020d 100644
--- a/metagpt/utils/repair_llm_raw_output.py
+++ b/metagpt/utils/repair_llm_raw_output.py
@@ -182,19 +182,23 @@ def repair_invalid_json(output: str, error: str) -> str:
         # different general problems
         if line.endswith("],"):
             # problem, redundant char `]`
-            line = line.replace("]", "")
+            new_line = line.replace("]", "")
         elif line.endswith("},") and not output.endswith("},"):
             # problem, redundant char `}`
-            line = line.replace("}", "")
+            new_line = line.replace("}", "")
         elif line.endswith("},") and output.endswith("},"):
-            line = line[:-1]
-        elif '",' not in line:
-            line = f'{line}",'
+            new_line = line[:-1]
+        elif '",' not in line and ',' not in line:
+            new_line = f'{line}",'
         elif "," not in line:
             # problem, miss char `,` at the end.
-            line = f"{line},"
+            new_line = f"{line},"
+        elif "," in line and len(line) == 1:
+            new_line = f'"{line}'
+        elif '",' in line:
+            new_line = line[:-2] + "',"
 
-        arr[line_no] = line
+        arr[line_no] = new_line
         output = "\n".join(arr)
         logger.info(f"repair_invalid_json, raw error: {error}")
 
diff --git a/tests/metagpt/utils/test_repair_llm_raw_output.py b/tests/metagpt/utils/test_repair_llm_raw_output.py
index 553b57625..acacb3af3 100644
--- a/tests/metagpt/utils/test_repair_llm_raw_output.py
+++ b/tests/metagpt/utils/test_repair_llm_raw_output.py
@@ -132,6 +132,48 @@ def test_repair_json_format():
     assert output == target_output
 
 
+def test_repair_invalid_json():
+    raw_output = """{
+    "key": "value"
+    },
+}"""
+    target_output = """{
+    "key": "value"
+,
+}"""
+    output = repair_invalid_json(raw_output, "Expecting ',' delimiter: line 3 column 1")
+    assert output == target_output
+
+    raw_output = """{
+    "key": "
+value
+    },
+}"""
+    target_output = """{
+    "key": "
+value
+",
+}"""
+    output = repair_invalid_json(raw_output, "Expecting ',' delimiter: line 4 column 1")
+    output = repair_invalid_json(output, "Expecting ',' delimiter: line 4 column 1")
+    assert output == target_output
+
+    raw_output = """{
+    "key": '
+value
+    },
+}"""
+    target_output = """{
+    "key": '
+value
+',
+}"""
+    output = repair_invalid_json(raw_output, "Expecting ',' delimiter: line 4 column 1")
+    output = repair_invalid_json(output, "Expecting ',' delimiter: line 4 column 1")
+    output = repair_invalid_json(output, "Expecting ',' delimiter: line 4 column 1")
+    assert output == target_output
+
+
 def test_retry_parse_json_text():
     invalid_json_text = """{
 "Original Requirements": "Create a 2048 game",