fix refreshToken crash

@@ -932,6 +932,7 @@ WL_VERSION_IMPLEMENTATION(WL_VERSION)
 
 - (void)refreshToken:(void(^)(NSDictionary *response))success failureBlock:(void(^)(NSError *error))failure
 {
+    if ([_db tableExists:@"requestVariables"] == YES) {
         FMResultSet *refreshTokenSet = [_db executeQuery:@"SELECT refresh_token FROM requestVariables WHERE id = 1;"];
         NSString *refreshToken = [NSString alloc];
         while ([refreshTokenSet next]) {
@@ -963,7 +964,7 @@ WL_VERSION_IMPLEMENTATION(WL_VERSION)
                 NSString* errorCode = [dict objectForKey:@"NSLocalizedDescription"];
                 if ([errorCode isEqual:@"Request failed: unauthorized (401)"]) {
                 [self refreshToken2ndTry:^(NSDictionary *response) {
-//          [_db executeUpdate:@"UPDATE requestVariables SET access_token = ?, refresh_token = ? WHERE id = 1", [response objectForKey:@"access_token"], [response objectForKey:@"refresh_token"]];
+        //          [_db executeUpdate:@"UPDATE requestVariables SET access_token = ?, refresh_token = ? WHERE id = 1", [response objectForKey:@"access_token"], [response objectForKey:@"refresh_token"]];
                 NSDictionary *successResponse = @{@"result": @"success", @"status":@1};
                 success(successResponse);
                 } failureBlock:^(NSError *error) {
@@ -977,6 +978,7 @@ WL_VERSION_IMPLEMENTATION(WL_VERSION)
             NSLog(@"Error at token %@", error );
             }
         }];
+    }
 }
 
 - (void)refreshToken2ndTry:(void(^)(NSDictionary *response))success failureBlock:(void(^)(NSError *error))failure