Jungle Wars: Indestructible dino glitch

In Jungle Wars, the glitches can work against us even when they appear to be in our favor.

I reached 55% in an attack against a player and was lucky to do so - his clan troops were chasing my attackers all over the village. But they couldn't kill this dino (right), who ran my winning percentage up to 90%

If I had hit the surrender button, I might have scored some cups but I got greedy and let the clock run out and an ERROR message appeared. Upon reboot, I saw my score had not changed (for better or worse) but my troops had been spent for nothing.

That picture shows the actual rascal being chased by enemy shaman. He took some hits but his health status bar got stuck there on low and he would not die.
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Update, 3/1: Spazz writes in public chat,

Update, 3/2: Today, I had an indestructible gorilla (see right). No error followed. The only unique aspect to this was that my troops included first time upgraded slingers. Hmmm.