Comment # 5 on bug 958078 from Joel Koreth

Encountered same bug on Tumbleweed possibly after a kernel update. Did not
upgrade from 13.2 or Leap, was installed from the DVD installer.

Solution is to delete duplicate entries with the .rpmorig extension.

See here :
forums.opensuse.org/showthread.php/519448-Duplicate-Entries-in-boot-menu?p=2789178