diff --git a/language.version b/language.version
index 0f34f0a81..878f5ab56 100644
--- a/language.version
+++ b/language.version
@@ -1,3 +1,3 @@
 [default]
-SWWM_MODVER="\chSWWM \czGZ\c- \cw0.9.11b-pre r566 \cu(Wed 30 Jun 19:55:45 CEST 2021)\c-";
-SWWM_SHORTVER="\cw0.9.11b-pre r566 \cu(2021-06-30 19:55:45)\c-";
+SWWM_MODVER="\chSWWM \czGZ\c- \cw0.9.11b-pre r567 \cu(Thu  1 Jul 10:09:16 CEST 2021)\c-";
+SWWM_SHORTVER="\cw0.9.11b-pre r567 \cu(2021-07-01 10:09:16)\c-";
diff --git a/zscript/handler/swwm_handler_vanillaboss.zsc b/zscript/handler/swwm_handler_vanillaboss.zsc
index 8a0fe00db..2defae930 100644
--- a/zscript/handler/swwm_handler_vanillaboss.zsc
+++ b/zscript/handler/swwm_handler_vanillaboss.zsc
@@ -392,10 +392,13 @@ extend Class SWWMHandler
 		if ( !bbar_d ) bbar_d = TexMan.CheckForTexture("graphics/HUD/BossHealthBarDecay.png",TexMan.Type_Any);
 		Vector2 vpos = ((bar.ss.x-300)/2.,bar.ss.y-(bar.margin+35));
 		Screen.DrawTexture(bbar_f,false,vpos.x-2,vpos.y-2,DTA_VirtualWidthF,bar.ss.x,DTA_VirtualHeightF,bar.ss.y,DTA_KeepRatio,true,DTA_Alpha,bossalpha);
-		int rw = int(clamp((ihealthr.GetValue()*300.)/hmax,0.,300.));
-		int dw = int(clamp((ihealth.GetValue()*300.)/hmax,0.,300.));
-		Screen.DrawTexture(bbar_d,false,vpos.x,vpos.y,DTA_VirtualWidthF,bar.ss.x,DTA_VirtualHeightF,bar.ss.y,DTA_KeepRatio,true,DTA_Alpha,bossalpha,DTA_WindowRight,dw);
-		Screen.DrawTexture(bbar_r,false,vpos.x,vpos.y,DTA_VirtualWidthF,bar.ss.x,DTA_VirtualHeightF,bar.ss.y,DTA_KeepRatio,true,DTA_Alpha,bossalpha,DTA_WindowRight,rw);
+		if ( hmax )
+		{
+			int rw = int(clamp((ihealthr.GetValue()*300.)/hmax,0.,300.));
+			int dw = int(clamp((ihealth.GetValue()*300.)/hmax,0.,300.));
+			Screen.DrawTexture(bbar_d,false,vpos.x,vpos.y,DTA_VirtualWidthF,bar.ss.x,DTA_VirtualHeightF,bar.ss.y,DTA_KeepRatio,true,DTA_Alpha,bossalpha,DTA_WindowRight,dw);
+			Screen.DrawTexture(bbar_r,false,vpos.x,vpos.y,DTA_VirtualWidthF,bar.ss.x,DTA_VirtualHeightF,bar.ss.y,DTA_KeepRatio,true,DTA_Alpha,bossalpha,DTA_WindowRight,rw);
+		}
 		Font barfnt = bar.LangFont(bar.mTewiFont);
 		Font dmgfnt = bar.mTewiFont.mFont;
 		if ( (cummdamage > 0) && (gametic < lastcummtic+150) )