avoid divide by zero
Change-Id: I7d6502c752a7b9f39f94d5cddd5f44240e0b6d04 (cherry picked from commit 92b936e3)
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Change-Id: I7d6502c752a7b9f39f94d5cddd5f44240e0b6d04 (cherry picked from commit 92b936e3)