Fix #1375

worldedit-core/src/main/java/com/sk89q/worldedit/extension/platform/PlatformCommandManager.java

@@ -112,6 +112,7 @@ import com.sk89q.worldedit.entity.Player;
 import com.sk89q.worldedit.event.Event;
 import com.sk89q.worldedit.event.platform.CommandEvent;
 import com.sk89q.worldedit.event.platform.CommandSuggestionEvent;
+import com.sk89q.worldedit.extension.input.InputParseException;
 import com.sk89q.worldedit.extent.Extent;
 import com.sk89q.worldedit.internal.annotation.Selection;
 import com.sk89q.worldedit.internal.command.CommandArgParser;
@@ -910,11 +911,22 @@ public final class PlatformCommandManager {
             try {
                 suggestions = commandManager.getSuggestions(access, argStrings);
             } catch (Throwable t) { // catch errors which are *not* command exceptions generated by parsers/suggesters
-                if (!(t instanceof CommandException)) {
-                    LOGGER.error("Unexpected error occurred while generating suggestions for input: {}", arguments, t);
-                    return;
+                if (!(t instanceof InputParseException) && !(t instanceof CommandException)) {
+                    Throwable cause = t;
+                    // These exceptions can be very nested, and should not be printed as they are not an actual error.
+                    boolean printError = true;
+                    while ((cause = cause.getCause()) != null) {
+                        if (cause instanceof InputParseException || cause instanceof CommandException) {
+                            printError = false;
+                            break;
+                        }
+                    }
+                    if (printError) {
+                        LOGGER.error("Unexpected error occurred while generating suggestions for input: {}", arguments, t);
+                        return;
+                    }
                 }
-                throw t;
+                return;
             }
 
             event.setSuggestions(suggestions.stream()