diff --git a/src/WorldStorage/FireworksSerializer.cpp b/src/WorldStorage/FireworksSerializer.cpp
index 3c97ae0a2..744fc731f 100644
--- a/src/WorldStorage/FireworksSerializer.cpp
+++ b/src/WorldStorage/FireworksSerializer.cpp
@@ -20,8 +20,14 @@ void cFireworkItem::WriteToNBTCompound(const cFireworkItem & a_FireworkItem, cFa
 			a_Writer.AddByte("Flicker", a_FireworkItem.m_HasFlicker);
 			a_Writer.AddByte("Trail", a_FireworkItem.m_HasTrail);
 			a_Writer.AddByte("Type", a_FireworkItem.m_Type);
-			a_Writer.AddIntArray("Colors", &(a_FireworkItem.m_Colours[0]), a_FireworkItem.m_Colours.size());
-			a_Writer.AddIntArray("FadeColors", &(a_FireworkItem.m_FadeColours[0]), a_FireworkItem.m_FadeColours.size());
+			if (!a_FireworkItem.m_Colours.empty())
+			{
+				a_Writer.AddIntArray("Colors", &(a_FireworkItem.m_Colours[0]), a_FireworkItem.m_Colours.size());
+			}
+			if (!a_FireworkItem.m_FadeColours.empty())
+			{
+				a_Writer.AddIntArray("FadeColors", &(a_FireworkItem.m_FadeColours[0]), a_FireworkItem.m_FadeColours.size());
+			}
 			a_Writer.EndCompound();
 			a_Writer.EndList();
 			a_Writer.EndCompound();