I haven't been active in the past decade, but here's a small patch. Main

branch only.  This adds a check when setting a new fruit so that if no fruits
have been created since the last time the option has been set, the current
fruit is overwritten.  Result: the user cannot repeatedly set the fruit
option and overflow the maximum fruit number.

src/mkobj.c

@@ -680,6 +680,7 @@ boolean artif;
 		break;
 	    case SLIME_MOLD:
 		otmp->spe = context.current_fruit;
+		flags.made_fruit = TRUE;
 		break;
 	    case KELP_FROND:
 		otmp->quan = (long) rnd(2);