I've been playing around with it some more and with this command it doesn't crash for me. Could you guys try it and tell me what happens?
/summon Skeleton ~ ~1 ~ {CustomName:"Skeletron",CustomNameVisible:1,Equipment:[{id:iron_sword,Count:1,tag:{ench:[{id:16,lvl:2},{id:19,lvl:1}]}},{id:leather_boots,Count:1,tag:{display:{color:3289650}}},{id:leather_leggings,Count:1,tag:{display:{color:3289650}}},{id:leather_chestplate,Count:1,tag:{display:{color:3289650}}},{id:skull,Damage:3,Count:1,tag:{display:{Name:"Skeletron's Head"},SkullOwner:{Id:"02f6930b-9b02-424f-9cd9-26e0890144ea",Properties:{textures:[{Value:"eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvZThiZTM5N2NhZmJjZjVmYThjYjRjZDc1YmI2MTc0MGIzZWRlN2FjMWNlN2Q3Njc1ZDkwOTNiMTZkZWIzMSJ9fX0="}]}}}}],DropChances:[0.0F,0.085F,0.085F,0.0F,1.0F],Attributes:[{Name:generic.maxHealth,Base:50},{Name:generic.knockbackResistance,Base:1}],Silent:1,ActiveEffects:[{Id:1,Amplifier:2,Duration:200000,ShowParticles:0b}]}