fix refreshToken crash

@@ -932,51 +932,53 @@ WL_VERSION_IMPLEMENTATION(WL_VERSION)
 
 - (void)refreshToken:(void(^)(NSDictionary *response))success failureBlock:(void(^)(NSError *error))failure
 {
-  FMResultSet *refreshTokenSet = [_db executeQuery:@"SELECT refresh_token FROM requestVariables WHERE id = 1;"];
-  NSString *refreshToken = [NSString alloc];
-  while ([refreshTokenSet next]) {
-    refreshToken = [[refreshTokenSet resultDictionary][@"refresh_token"] stringValue];
-  }
-  FMResultSet *clientIdSet = [_db executeQuery:@"SELECT client_id FROM requestVariables WHERE id = 1;"];
-  NSString *clientId = [NSString alloc];
-  while ([clientIdSet next]) {
-    clientId = [[clientIdSet resultDictionary][@"client_id"] stringValue];
-  }
-  FMResultSet *clientSecretSet = [_db executeQuery:@"SELECT client_secret FROM requestVariables WHERE id = 1;"];
-  NSString *clientSecret = [NSString alloc];
-  while ([clientSecretSet next]) {
-    clientSecret = [[clientSecretSet resultDictionary][@"client_secret"] stringValue];
-  }
-  
-  NSDictionary *postDictionary3 = @{@"client_id": clientId, @"client_secret": clientSecret, @"refresh_token": refreshToken, @"grant_type":@"refresh_token",  };
-  NSData *jsonData3 = [NSJSONSerialization dataWithJSONObject:postDictionary3 options:0 error:NULL];
-  [self sendContext5:jsonData3 successBlock:^(NSDictionary *contextResponse) {
-      if (success) {
-        [_db executeUpdate:@"UPDATE requestVariables SET access_token = ?, refresh_token = ? WHERE id = 1", [contextResponse objectForKey:@"access_token"], [contextResponse objectForKey:@"refresh_token"]];
-        NSDictionary *successResponse = @{@"result": @"success", @"status":@1};
-        success(successResponse);
-      }
-  } failureBlock:^(NSError *error) {
-      if (failure) {
-        NSDictionary* dict = [NSDictionary alloc];
-        dict = [error userInfo];
-        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"]];
-          NSDictionary *successResponse = @{@"result": @"success", @"status":@1};
-          success(successResponse);
+    if ([_db tableExists:@"requestVariables"] == YES) {
+        FMResultSet *refreshTokenSet = [_db executeQuery:@"SELECT refresh_token FROM requestVariables WHERE id = 1;"];
+        NSString *refreshToken = [NSString alloc];
+        while ([refreshTokenSet next]) {
+            refreshToken = [[refreshTokenSet resultDictionary][@"refresh_token"] stringValue];
+        }
+        FMResultSet *clientIdSet = [_db executeQuery:@"SELECT client_id FROM requestVariables WHERE id = 1;"];
+        NSString *clientId = [NSString alloc];
+        while ([clientIdSet next]) {
+            clientId = [[clientIdSet resultDictionary][@"client_id"] stringValue];
+        }
+        FMResultSet *clientSecretSet = [_db executeQuery:@"SELECT client_secret FROM requestVariables WHERE id = 1;"];
+        NSString *clientSecret = [NSString alloc];
+        while ([clientSecretSet next]) {
+            clientSecret = [[clientSecretSet resultDictionary][@"client_secret"] stringValue];
+        }
+        
+        NSDictionary *postDictionary3 = @{@"client_id": clientId, @"client_secret": clientSecret, @"refresh_token": refreshToken, @"grant_type":@"refresh_token",  };
+        NSData *jsonData3 = [NSJSONSerialization dataWithJSONObject:postDictionary3 options:0 error:NULL];
+        [self sendContext5:jsonData3 successBlock:^(NSDictionary *contextResponse) {
+            if (success) {
+                [_db executeUpdate:@"UPDATE requestVariables SET access_token = ?, refresh_token = ? WHERE id = 1", [contextResponse objectForKey:@"access_token"], [contextResponse objectForKey:@"refresh_token"]];
+                NSDictionary *successResponse = @{@"result": @"success", @"status":@1};
+                success(successResponse);
+            }
         } failureBlock:^(NSError *error) {
-          if (failure) {
-            [_db executeUpdate:@"DROP TABLE requestVariables"];
-            failure(error);
-          }
-          NSLog(@"Error at token %@", error );
+            if (failure) {
+                NSDictionary* dict = [NSDictionary alloc];
+                dict = [error userInfo];
+                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"]];
+                NSDictionary *successResponse = @{@"result": @"success", @"status":@1};
+                success(successResponse);
+                } failureBlock:^(NSError *error) {
+                if (failure) {
+                    [_db executeUpdate:@"DROP TABLE requestVariables"];
+                    failure(error);
+                }
+                NSLog(@"Error at token %@", error );
+                }];
+            }
+            NSLog(@"Error at token %@", error );
+            }
         }];
-      }
-      NSLog(@"Error at token %@", error );
-      }
-  }];
+    }
 }
 
 - (void)refreshToken2ndTry:(void(^)(NSDictionary *response))success failureBlock:(void(^)(NSError *error))failure