diff --git a/client/src/components/AuthDebugger.tsx b/client/src/components/AuthDebugger.tsx
index 48c9cb00..ec09963e 100644
--- a/client/src/components/AuthDebugger.tsx
+++ b/client/src/components/AuthDebugger.tsx
@@ -64,18 +64,22 @@ const AuthDebugger = ({
   useEffect(() => {
     if (serverUrl && !authState.oauthTokens) {
       const checkTokens = async () => {
-        const provider = new DebugInspectorOAuthClientProvider(serverUrl);
-        const existingTokens = await provider.tokens();
-        if (existingTokens) {
-          updateAuthState({
-            oauthTokens: existingTokens,
-            oauthStep: "complete",
-          });
+        try {
+          const provider = new DebugInspectorOAuthClientProvider(serverUrl);
+          const existingTokens = await provider.tokens();
+          if (existingTokens) {
+            updateAuthState({
+              oauthTokens: existingTokens,
+              oauthStep: "complete",
+            });
+          }
+        } catch (error) {
+          console.error("Failed to load existing OAuth tokens:", error);
         }
       };
       checkTokens();
     }
-  }, [serverUrl]); // Only run when serverUrl changes
+  }, [serverUrl, updateAuthState, authState.oauthTokens]);
 
   const startOAuthFlow = useCallback(() => {
     if (!serverUrl) {
diff --git a/client/src/components/__tests__/AuthDebugger.test.tsx b/client/src/components/__tests__/AuthDebugger.test.tsx
index b0df65eb..b2fa4c61 100644
--- a/client/src/components/__tests__/AuthDebugger.test.tsx
+++ b/client/src/components/__tests__/AuthDebugger.test.tsx
@@ -202,7 +202,7 @@ describe("AuthDebugger", () => {
 
       // Should first discover and save OAuth metadata
       expect(mockDiscoverOAuthMetadata).toHaveBeenCalledWith(
-        "https://example.com",
+        new URL("https://example.com"),
       );
 
       // Check that updateAuthState was called with the right info message
@@ -314,6 +314,11 @@ describe("AuthDebugger", () => {
       });
 
       expect(updateAuthState).toHaveBeenCalledWith({
+        authServerUrl: null,
+        authorizationUrl: null,
+        isInitiatingAuth: false,
+        resourceMetadata: null,
+        resourceMetadataError: null,
         oauthTokens: null,
         oauthStep: "metadata_discovery",
         latestError: null,
@@ -355,7 +360,7 @@ describe("AuthDebugger", () => {
       });
 
       expect(mockDiscoverOAuthMetadata).toHaveBeenCalledWith(
-        "https://example.com",
+        new URL("https://example.com"),
       );
     });