diff --git a/src/services/userPointsService.ts b/src/services/userPointsService.ts
index 8725b4c..bd2c035 100644
--- a/src/services/userPointsService.ts
+++ b/src/services/userPointsService.ts
@@ -41,24 +41,44 @@ export async function ensureUserExists(userId: string, email: string, name?: str
       
       // Fallback to direct insert
       try {
-        const { data: insertData, error: insertError } = await supabaseAdmin
+        // First check if the user already exists
+        const { data: existingUser, error: checkError } = await supabaseAdmin
           .from('users')
-          .insert({
-            id: userId,
-            email: email,
-            name: name || null,
-            first_login: new Date().toISOString(),
-            last_login: new Date().toISOString()
-          })
-          .onConflict('id')
-          .merge({ last_login: new Date().toISOString() });
+          .select('id')
+          .eq('id', userId)
+          .maybeSingle();
           
-        if (insertError) {
-          console.error('Error inserting user:', insertError);
-          return null;
+        if (!checkError && existingUser) {
+          // User exists, update last_login
+          const { error: updateError } = await supabaseAdmin
+            .from('users')
+            .update({ last_login: new Date().toISOString() })
+            .eq('id', userId);
+            
+          if (updateError) {
+            console.warn('Error updating user last_login:', updateError);
+          }
+          
+          return userId;
+        } else {
+          // User doesn't exist, insert new user
+          const { data: insertData, error: insertError } = await supabaseAdmin
+            .from('users')
+            .insert({
+              id: userId,
+              email: email,
+              name: name || null,
+              first_login: new Date().toISOString(),
+              last_login: new Date().toISOString()
+            });
+            
+          if (insertError) {
+            console.error('Error inserting user:', insertError);
+            return null;
+          }
+          
+          return userId;
         }
-        
-        return userId;
       } catch (err) {
         console.error('Error in fallback user creation:', err);
         return null;