diff --git a/docs/Whats-New.md b/docs/Whats-New.md
index b40c28886b..89ab0c093f 100644
--- a/docs/Whats-New.md
+++ b/docs/Whats-New.md
@@ -505,6 +505,7 @@ Phobos fixes:
 - Fixed an interaction error between the engineer and the Ares rubble (by FlyStar)
 - Fixed the projection location of selectbox when over elevated bridge (by NetsuNegi)
 - Fixed an issue where the game would only use `Weapon1` and `Weapon2` for auto-targeting even when `MultiWeapon=yes` was set (by FlyStar)
+- Fixed a game load crash caused by `MultiWeapon.IsSecondary=-1` or non-projectile weapons (by FlyStar)
 
 Fixes / interactions with other extensions:
 - Allowed `AuxBuilding` and Ares' `SW.Aux/NegBuildings` to count building upgrades (by Ollerus)
diff --git a/src/Ext/TechnoType/Body.cpp b/src/Ext/TechnoType/Body.cpp
index edde10ab88..7e03b7ca64 100644
--- a/src/Ext/TechnoType/Body.cpp
+++ b/src/Ext/TechnoType/Body.cpp
@@ -389,14 +389,18 @@ void TechnoTypeExt::ExtData::UpdateAdditionalAttributes()
 
 		if (pWeapon)
 		{
-			this->ThreatTypes.X |= pWeapon->AllowedThreats();
+			if (pWeapon->Projectile)
+				this->ThreatTypes.X |= pWeapon->AllowedThreats();
+
 			this->CombatDamages.X += (pWeapon->Damage + pWeapon->AmbientDamage);
 			num++;
 		}
 
 		if (pEliteWeapon)
 		{
-			this->ThreatTypes.Y |= pEliteWeapon->AllowedThreats();
+			if (pEliteWeapon->Projectile)
+				this->ThreatTypes.Y |= pEliteWeapon->AllowedThreats();
+
 			this->CombatDamages.Y += (pEliteWeapon->Damage + pEliteWeapon->AmbientDamage);
 			eliteNum++;
 		}