Null exception while checking if variable is null

Message "Check" is displayed but I receive a message about nullpointer exception in console in the line with if statement. Code is executed in BukkitRunnable. Why does it throw exceptions?

Code:

for (ItemStack is : player.getInventory().getContents()) {                        
        if (is.getType() != null && is != null) {  //exception thrown
             player.sendMessage("Check");
 }
 else {
       continue;
}
}

Code:

Error:
[01:26:27] [Server thread/WARN]: [FirstPlugin] Task #2 for FirstPlugin v0.1 generated an exception
java.lang.NullPointerException: null
        at runnables.ItemChecker$1.run(ItemChecker.java:46) ~[?:?]
        at org.bukkit.craftbukkit.v1_16_R1.scheduler.CraftTask.run(CraftTask.java:81) ~[spigot.jar:git-Spigot-0287a20-7560f5f]
        at org.bukkit.craftbukkit.v1_16_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:400) ~[spigot.jar:git-Spigot-0287a20-7560f5f]
        at net.minecraft.server.v1_16_R1.MinecraftServer.b(MinecraftServer.java:1061) ~[spigot.jar:git-Spigot-0287a20-7560f5f]
        at net.minecraft.server.v1_16_R1.DedicatedServer.b(DedicatedServer.java:354) ~[spigot.jar:git-Spigot-0287a20-7560f5f]
        at net.minecraft.server.v1_16_R1.MinecraftServer.a(MinecraftServer.java:1009) ~[spigot.jar:git-Spigot-0287a20-7560f5f]
        at net.minecraft.server.v1_16_R1.MinecraftServer.v(MinecraftServer.java:848) ~[spigot.jar:git-Spigot-0287a20-7560f5f]
        at net.minecraft.server.v1_16_R1.MinecraftServer.lambda$0(MinecraftServer.java:164) ~[spigot.jar:git-Spigot-0287a20-7560f5f]
        at java.lang.Thread.run(Thread.java:834) [?:?]

 

Yea, remember, things are evaluated from left to right just like you read. So you are asking the JVM to first check if is.getType() is null, then you're telling it if so now check if is is null. I'm sure you can see the issue there, heh.