Central crash when calling a submission

1. What is the problem? Be very detailed.
Central crash when calling a submission
2. What app or server are you using and on what device and operating system? Include version numbers.
ubuntu 16 central 7f1a375..778e65f v0.7 origin/v0.7 google cloud 8gb ram
3. What you have you tried to fix the problem?
Do not try any solution because in the nginx log it shows nothing that is bad.

4. What steps can we take to reproduce the problem?
upload a form, load an entry and then try to see the entry is loading until it falls central

5. Anything else we should know or have? If you have a test form or screenshots or logs, attach below.

Relevamiento_de_PC.xml (15.4 KB)