Migrate a NodeBB forum with MongoDB to Discourse

Great work really. While I was trying, I am getting below error. Any idea what I might be doing wrong here?

importing groups
   10 / 10 (100.0%)  [474765 items/min]    
importing top level categories...
    8 / 8 (100.0%)  [437896 items/min]    
importing child categories...
   68 / 68 (100.0%)  [774048 items/min]  
importing users
 5534 / 5534 (100.0%)  [355520 items/min]    
adding users to groups...

importing topics...
Traceback (most recent call last):
	12: from script/import_scripts/nodebb/nodebb.rb:532:in `<main>'
	11: from /home/fsuzer/discourse/script/import_scripts/base.rb:47:in `perform'
	10: from script/import_scripts/nodebb/nodebb.rb:52:in `execute'
	 9: from script/import_scripts/nodebb/nodebb.rb:336:in `import_topics'
	 8: from /home/fsuzer/discourse/script/import_scripts/base.rb:877:in `batches'
	 7: from /home/fsuzer/discourse/script/import_scripts/base.rb:877:in `loop'
	 6: from /home/fsuzer/discourse/script/import_scripts/base.rb:878:in `block in batches'
	 5: from script/import_scripts/nodebb/nodebb.rb:337:in `block in import_topics'
	 4: from /home/fsuzer/discourse/script/import_scripts/nodebb/mongo.rb:71:in `topics'
	 3: from /home/fsuzer/discourse/script/import_scripts/nodebb/mongo.rb:71:in `map'
	 2: from /home/fsuzer/discourse/script/import_scripts/nodebb/mongo.rb:71:in `block in topics'
	 1: from /home/fsuzer/discourse/script/import_scripts/nodebb/mongo.rb:79:in `topic'
/home/fsuzer/discourse/script/import_scripts/nodebb/mongo.rb:100:in `post': undefined method `[]' for nil:NilClass (NoMethodError)