diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
index d36443dde..2ce42e799 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
@@ -1639,7 +1639,6 @@ public final class CraftServer implements Server {
     @Deprecated
     public OfflinePlayer getOfflinePlayer(String name) {
         Preconditions.checkArgument(name != null, "name cannot be null");
-        Preconditions.checkArgument(!name.isBlank(), "name cannot be empty");
 
         OfflinePlayer result = getPlayerExact(name);
         if (result == null) {
@@ -1707,7 +1706,6 @@ public final class CraftServer implements Server {
     @Override
     public void banIP(String address) {
         Preconditions.checkArgument(address != null, "address cannot be null");
-        Preconditions.checkArgument(!address.isBlank(), "address cannot be empty");
 
         this.getBanList(org.bukkit.BanList.Type.IP).addBan(address, null, null, null);
     }
@@ -1715,7 +1713,6 @@ public final class CraftServer implements Server {
     @Override
     public void unbanIP(String address) {
         Preconditions.checkArgument(address != null, "address cannot be null");
-        Preconditions.checkArgument(!address.isBlank(), "address cannot be empty");
 
         this.getBanList(org.bukkit.BanList.Type.IP).pardon(address);
     }
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
index 6f724ac7a..85e55279f 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -1565,7 +1565,6 @@ public class CraftWorld extends CraftRegionAccessor implements World {
     public void playSound(Location loc, String sound, org.bukkit.SoundCategory category, float volume, float pitch) {
         Preconditions.checkArgument(loc != null, "Location cannot be null");
         Preconditions.checkArgument(sound != null, "Sound cannot be null");
-        Preconditions.checkArgument(!sound.isBlank(), "Sound cannot be empty");
         Preconditions.checkArgument(category != null, "Category cannot be null");
 
         double x = loc.getX();
@@ -1674,7 +1673,7 @@ public class CraftWorld extends CraftRegionAccessor implements World {
     @Override
     public boolean isGameRule(String rule) {
         Preconditions.checkArgument(rule != null, "String rule cannot be null");
-        Preconditions.checkArgument(!rule.isBlank(), "String rule cannot be empty");
+        Preconditions.checkArgument(!rule.isEmpty(), "String rule cannot be empty");
         return getGameRulesNMS().containsKey(rule);
     }
 
diff --git a/src/main/java/org/bukkit/craftbukkit/block/CraftStructureBlock.java b/src/main/java/org/bukkit/craftbukkit/block/CraftStructureBlock.java
index 39488f723..cbca862ca 100644
--- a/src/main/java/org/bukkit/craftbukkit/block/CraftStructureBlock.java
+++ b/src/main/java/org/bukkit/craftbukkit/block/CraftStructureBlock.java
@@ -42,7 +42,7 @@ public class CraftStructureBlock extends CraftBlockEntityState<TileEntityStructu
     @Override
     public void setAuthor(String author) {
         Preconditions.checkArgument(author != null, "Author name cannot be null");
-        Preconditions.checkArgument(!author.isBlank(), "Author name cannot be empty");
+        Preconditions.checkArgument(!author.isEmpty(), "Author name cannot be empty");
         getSnapshot().author = author;
     }