diff --git a/language.version b/language.version
index 9e626b4fc..91bf26021 100644
--- a/language.version
+++ b/language.version
@@ -1,3 +1,3 @@
 [default]
-SWWM_MODVER="\cyDEMOLITIONIST \cw1.3pre r976 \cu(Tue 10 Oct 17:09:00 CEST 2023)\c-";
-SWWM_SHORTVER="\cw1.3pre r976 \cu(2023-10-10 17:09:00)\c-";
+SWWM_MODVER="\cyDEMOLITIONIST \cw1.3pre r977 \cu(Tue 10 Oct 17:25:58 CEST 2023)\c-";
+SWWM_SHORTVER="\cw1.3pre r977 \cu(2023-10-10 17:25:58)\c-";
diff --git a/zscript/player/swwm_player_tick.zsc b/zscript/player/swwm_player_tick.zsc
index 2b65b64bc..15626c6d6 100644
--- a/zscript/player/swwm_player_tick.zsc
+++ b/zscript/player/swwm_player_tick.zsc
@@ -261,6 +261,8 @@ extend Class Demolitionist
 		if ( vel dot vel > lagvel dot lagvel ) lagvel = lagvel*.8+vel*.2;
 		else lagvel = lagvel*.4+vel*.6;
 		double traveldist = level.Vec3Diff(oldpos,pos).length();
+		if ( (traveldist == double.infinity) || (traveldist == double.nan) )
+			traveldist = 0.;	// prevent glitches from breaking stats
 		if ( !player.onground || bNoGravity )
 		{
 			if ( waterlevel > 1 )
diff --git a/zscript/utility/swwm_utility_achievements.zsc b/zscript/utility/swwm_utility_achievements.zsc
index 3e3a2643f..f1eb48b9f 100644
--- a/zscript/utility/swwm_utility_achievements.zsc
+++ b/zscript/utility/swwm_utility_achievements.zsc
@@ -67,6 +67,8 @@ extend class SWWMUtility
 			if ( developer >= 2 ) Console.Printf("AchievementProgress: achievement '"..pvar.."' not found");
 			return;
 		}
+		if ( pval == "NaN" )	// this can happen, yup
+			pval = "0";
 		hnd.achievementprogress.Insert(pvar,String.Format("%g",pval.ToDouble()+inc));
 	}
 	// for bitfields