diff --git a/solution/0100-0199/0177.Nth Highest Salary/README.md b/solution/0100-0199/0177.Nth Highest Salary/README.md
index 74da21d30cbf7..b73d5122803b9 100644
--- a/solution/0100-0199/0177.Nth Highest Salary/README.md	
+++ b/solution/0100-0199/0177.Nth Highest Salary/README.md	
@@ -95,6 +95,8 @@ import pandas as pd
 
 
 def nth_highest_salary(employee: pd.DataFrame, N: int) -> pd.DataFrame:
+    if N < 1:
+        return pd.DataFrame({"getNthHighestSalary(" + str(N) + ")": [None]})
     unique_salaries = employee.salary.unique()
     if len(unique_salaries) < N:
         return pd.DataFrame([np.NaN], columns=[f"getNthHighestSalary({N})"])
diff --git a/solution/0100-0199/0177.Nth Highest Salary/README_EN.md b/solution/0100-0199/0177.Nth Highest Salary/README_EN.md
index 3373a1cd68980..3aa669d3b53d7 100644
--- a/solution/0100-0199/0177.Nth Highest Salary/README_EN.md	
+++ b/solution/0100-0199/0177.Nth Highest Salary/README_EN.md	
@@ -93,6 +93,8 @@ import pandas as pd
 
 
 def nth_highest_salary(employee: pd.DataFrame, N: int) -> pd.DataFrame:
+    if N < 1:
+        return pd.DataFrame({"getNthHighestSalary(" + str(N) + ")": [None]})
     unique_salaries = employee.salary.unique()
     if len(unique_salaries) < N:
         return pd.DataFrame([np.NaN], columns=[f"getNthHighestSalary({N})"])
diff --git a/solution/0100-0199/0177.Nth Highest Salary/Solution.py b/solution/0100-0199/0177.Nth Highest Salary/Solution.py
index 243d9cf95a300..a2f85a1b09486 100644
--- a/solution/0100-0199/0177.Nth Highest Salary/Solution.py	
+++ b/solution/0100-0199/0177.Nth Highest Salary/Solution.py	
@@ -2,6 +2,8 @@
 
 
 def nth_highest_salary(employee: pd.DataFrame, N: int) -> pd.DataFrame:
+    if N < 1:
+        return pd.DataFrame({"getNthHighestSalary(" + str(N) + ")": [None]})
     unique_salaries = employee.salary.unique()
     if len(unique_salaries) < N:
         return pd.DataFrame([np.NaN], columns=[f"getNthHighestSalary({N})"])