diff --git a/src/main/java/gdx/liftoff/ui/panels/PathsPanel.java b/src/main/java/gdx/liftoff/ui/panels/PathsPanel.java
index 64b02709..770ddfbd 100644
--- a/src/main/java/gdx/liftoff/ui/panels/PathsPanel.java
+++ b/src/main/java/gdx/liftoff/ui/panels/PathsPanel.java
@@ -154,6 +154,13 @@ private void updateDeleteProjectPathButton() {
     }
 
     public void updateError() {
+
+        if (UserData.platforms.contains("html") && Configuration.Companion.parseJavaVersion(UserData.javaVersion) > 11) {
+            errorLabel.restart(prop.getProperty("htmlWrongJavaVersion"));
+            errorLabel.skipToTheEnd();
+            return;
+        }
+
         if (UserData.platforms.contains("ios") && UserData.platforms.contains("teavm")) {
             errorLabel.restart(prop.getProperty("iosTeavmIncompatible"));
             errorLabel.skipToTheEnd();
diff --git a/src/main/resources/ui-data/nls.properties b/src/main/resources/ui-data/nls.properties
index 469bd305..f953d703 100644
--- a/src/main/resources/ui-data/nls.properties
+++ b/src/main/resources/ui-data/nls.properties
@@ -274,7 +274,7 @@ androidTip=Android mobile backend. Needs Android SDK.
 coreTip=Main module shared by all platforms.
 iosTip=iOS mobile backend using RoboVM (Java 7-8 only).
 ios-moeTip=iOS mobile backend using Multi-OS Engine.
-htmlTip=Web backend using GWT; can only use Java.
+htmlTip=Web backend using GWT; can only use Java 11 or lower.
 headlessTip=Desktop backend without a graphical interface.
 lwjgl2Tip=Legacy desktop backend using LWJGL2.
 lwjgl3Tip=Primary desktop backend using LWJGL3.
@@ -767,6 +767,7 @@ notEmpty={SICK=0.35;0.4}{GRADIENT=FIREBRICK;SCARLET;1.1;7.0}%s name cannot be em
 nameNotValid={SICK=0.35;0.4}{GRADIENT=FIREBRICK;SCARLET;1.1;7.0}Project name must contain at least one alphanumeric char, and cannot contain a colon ( : ).{ENDGRADIENT}{ENDSICK}
 classNotValid={SICK=0.35;0.4}{GRADIENT=FIREBRICK;SCARLET;1.1;7.0}Main class name is not a valid Java identifier.{ENDGRADIENT}{ENDSICK}
 packageNotValid={SICK=0.35;0.4}{GRADIENT=FIREBRICK;SCARLET;1.1;7.0}Package name is not a valid Java package, or lacks a dot ( . ).{ENDGRADIENT}{ENDSICK}
+htmlWrongJavaVersion={SICK=0.35;0.4}{GRADIENT=FIREBRICK;SCARLET;1.1;7.0}Java version must be 11 or lower for HTML (GWT) compatibility.{ENDGRADIENT}{ENDSICK}
 iosTeavmIncompatible={SICK=0.35;0.4}{GRADIENT=FIREBRICK;SCARLET;1.1;7.0}TeaVM and RoboVM (for iOS) are incompatible; consider MOE for iOS.{ENDGRADIENT}{ENDSICK}
 iosWrongJavaVersion={SICK=0.35;0.4}{GRADIENT=FIREBRICK;SCARLET;1.1;7.0}Java version must be 7 or 8 for iOS compatibility.{ENDGRADIENT}{ENDSICK}
 teavmWrongJavaVersion={SICK=0.35;0.4}{GRADIENT=FIREBRICK;SCARLET;1.1;7.0}Java version must be 11 or greater for TeaVM compatibility.{ENDGRADIENT}{ENDSICK}