[automerger] Fix possible out of bounds read am: 3762e06152 am: ecc92a1a86 am: 1c7bb87a42 am: 4cdd5c3af5 am: bad0533d2e am: 19d1113bb0 am: 8aeab2cad9

Change-Id: I783c7188d71b1f0bd36320a94fcbd9a9e7e39228