Merge https://github.com/ValveSoftware/halflife/pull/1599

dlls/weapons.cpp

@@ -578,6 +578,13 @@ void CBasePlayerItem::DefaultTouch( CBaseEntity *pOther )
 	}
 
 	SUB_UseTargets( pOther, USE_TOGGLE, 0 ); // UNDONE: when should this happen?
+
+	// If the item is falling and its Think remains FallItem after the player picks it up,
+	// then after the item touches the ground its Touch will be set back to DefaultTouch,
+	// so the player will pick it up again, this time Kill-ing the item (since we already have it in the inventory),
+	// which will make the pointer bad and crash the game.
+	if( m_pfnThink == &CBasePlayerItem::FallThink )
+		SetThink( NULL );
 }
 
 BOOL CanAttack( float attack_time, float curtime, BOOL isPredicted )