Fold to a river donk for 1 bet?

[Watkins]

I had no reads on villain at the time, FWIW he later turns out to be 17%/1.35/0.78 over 150 hands. I don't think any of this matters though I called the river here but regardless of results should I have folded to the river donk?

Prima Poker skin
Limit Holdem Ring game
Limit: $0.50/$1
9 players
Converter

Stack sizes:
UTG: $7.25
UTG+1: $14.50
MP1: $58.25
MP2: $62.41
MP3: $24.25
CO: $51.25
Hero: $54.00
SB: $25.00
BB: $18.78

Pre-flop: (9 players) Hero is Button with Q[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/heart.gif[/img]
2 folds, MP1 calls, 3 folds, <font color="#cc0000">Hero raises</font>, 2 folds, MP1 calls.

Flop: 9[img]/images/graemlins/heart.gif[/img] K[img]/images/graemlins/club.gif[/img] 7[img]/images/graemlins/club.gif[/img] (5.5SB, 2 players)
MP1 checks, <font color="#cc0000">Hero bets</font>, MP1 calls.

Turn: T[img]/images/graemlins/spade.gif[/img] (3.75BB, 2 players)
MP1 checks, <font color="#cc0000">Hero bets</font>, MP1 calls.

River: Q[img]/images/graemlins/spade.gif[/img] (5.75BB, 2 players)
<font color="#cc0000">MP1 bets</font>, Hero calls.

Results:
Final pot: 7.75BB