diff --git a/src/sonic-bgpcfgd/staticroutebfd/main.py b/src/sonic-bgpcfgd/staticroutebfd/main.py
index 268dbd3c1669..89f10f2dca5a 100644
--- a/src/sonic-bgpcfgd/staticroutebfd/main.py
+++ b/src/sonic-bgpcfgd/staticroutebfd/main.py
@@ -376,7 +376,7 @@ def static_route_set_handler(self, key, data):
 
         valid, is_ipv4, ip = check_ip(ip_prefix)
         if not valid:
-            log_err("invalid ip prefix for static route: ", key)
+            log_err("invalid ip prefix for static route: '%s'"%(key))
             return True
 
         #use lower case if there is letter in IPv6 address string
diff --git a/src/sonic-bgpcfgd/tests/test_static_rt_bfd.py b/src/sonic-bgpcfgd/tests/test_static_rt_bfd.py
index f9b6139244b8..5198e50eae5c 100644
--- a/src/sonic-bgpcfgd/tests/test_static_rt_bfd.py
+++ b/src/sonic-bgpcfgd/tests/test_static_rt_bfd.py
@@ -171,6 +171,23 @@ def test_set_del_ipv6():
         {'del_default:2603:10e2:400::4/128': { }}
     )
 
+@patch('staticroutebfd.main.log_err')
+def test_invalid_key(mocked_log_err):
+    dut = constructor()
+    intf_setup(dut)
+
+    set_del_test(dut, "srt",
+        "SET",
+        ("2.2.2/24", {
+            "bfd": "true",
+            "nexthop": "192.168.1.2 , 192.168.2.2, 192.168.3.2",
+            "ifname": "if1, if2, if3",
+        }),
+        {},
+        {}
+    )
+    mocked_log_err.assert_called_with("invalid ip prefix for static route: '2.2.2/24'")
+
 def test_set_del():
     dut = constructor()
     intf_setup(dut)