[MC-132502] Can't use CustomName in pre-5

Environment

i wanna naturally spawning mobs but CustomName doens't works i can use CustomNameVisible and says "Unable summon object" why?

Linked issues

duplicates 1

MC-123807 Item, entity, block, team, and objective display names must be valid JSON text components Resolved

Comments 1

migrated 2018-07-02T00:19:26Z

Please attach the crash report ([minecraft|http://hopper.minecraft.net/help/finding-minecraft-data-folder]/crash-reports/crash-<DATE>-client.txt), otherwise we can not diagnose this issue.
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