migration failed 1.4.13 to 1.5.1

can someone help me with the migration?

Failed to update project ("myProject") version with error: Invalid document structure: Missing required attribute "time" Invalid document structure: Missing required attribute "time"

TL;DR

Migration from version 1.4.13 to 1.5.1 failed due to a missed migration. A fix is in progress for projects existing since v0.15 and earlier. The error indicates a missing "time" attribute in the document structure.