/blockdata ~ ~-1 ~ {Text1:"{text:\"Test\",bold:\"true\",color:black,clickEvent:{action:\"run_command\",value:\"/tellraw @a {text:\\\"Test\\\",color:red}\"}}",Text2:" ",Text3:" ",Text4:" "}
on a sign crashes the game.... I did not write or run this command and it seems to only happen with a specific sign in my world so I have no idea how to repoduce it yet other than cloning the bugged sign
Thank you for your report.
However, your ticket has been resolved as a duplicate.
This issue has been linked to the original bugreport: MC-83460. You can find or add further information on that report.
Please search before reporting any bugs, as it's likely that one exists already.