diff --git a/.vscode/settings.json b/.vscode/settings.json
index 1c6f226ee..184fb50f4 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -10,5 +10,6 @@
 	//Use consistent indentation
 	"editor.detectIndentation": false,
 	"editor.tabSize": 4,
-	"editor.insertSpaces": false
+	"editor.insertSpaces": false,
+	"java.compile.nullAnalysis.mode": "automatic",
 }
\ No newline at end of file
diff --git a/org.eclipse.lemminx/src/main/java/org/eclipse/lemminx/extensions/contentmodel/participants/ContentModelCodeLensParticipant.java b/org.eclipse.lemminx/src/main/java/org/eclipse/lemminx/extensions/contentmodel/participants/ContentModelCodeLensParticipant.java
index f25bce0c6..f404a6e19 100644
--- a/org.eclipse.lemminx/src/main/java/org/eclipse/lemminx/extensions/contentmodel/participants/ContentModelCodeLensParticipant.java
+++ b/org.eclipse.lemminx/src/main/java/org/eclipse/lemminx/extensions/contentmodel/participants/ContentModelCodeLensParticipant.java
@@ -33,6 +33,7 @@
 import org.eclipse.lemminx.utils.XMLPositionUtility;
 import org.eclipse.lsp4j.CodeLens;
 import org.eclipse.lsp4j.Command;
+import org.eclipse.lsp4j.Position;
 import org.eclipse.lsp4j.Range;
 import org.eclipse.lsp4j.TextDocumentEdit;
 import org.eclipse.lsp4j.jsonrpc.CancelChecker;
@@ -91,7 +92,14 @@ private void createReferencedGrammarLenses(ICodeLensRequest request, List<CodeLe
 		// The DOM document is bound with a schema/grammar, display the referenced
 		// grammars as Codelens.
 		boolean canSupportOpenUri = canSupportOpenUri(request);
-		Range range = XMLPositionUtility.createRange((DOMRange) document.getFirstChild());
+		Range range;
+		// If the grammar is bound using a file association, then the file could be empty
+		if (document.getFirstChild() == null) {
+			range = new Range();
+			range.setStart(new Position(0, 0));
+		} else {
+			range = XMLPositionUtility.createRange((DOMRange) document.getFirstChild());
+		}
 		range.setEnd(range.getStart());
 		Set<ReferencedGrammarInfo> referencedGrammarInfos = contentModelManager.getReferencedGrammarInfos(document);
 		for (ReferencedGrammarInfo info : referencedGrammarInfos) {
diff --git a/org.eclipse.lemminx/src/test/java/org/eclipse/lemminx/extensions/contentmodel/AssociateGrammarCodeLensExtensionsTest.java b/org.eclipse.lemminx/src/test/java/org/eclipse/lemminx/extensions/contentmodel/AssociateGrammarCodeLensExtensionsTest.java
index bf7368357..3b5bc8acb 100644
--- a/org.eclipse.lemminx/src/test/java/org/eclipse/lemminx/extensions/contentmodel/AssociateGrammarCodeLensExtensionsTest.java
+++ b/org.eclipse.lemminx/src/test/java/org/eclipse/lemminx/extensions/contentmodel/AssociateGrammarCodeLensExtensionsTest.java
@@ -168,6 +168,30 @@ public void referencedGrammarUsingFileAssociation() throws BadLocationException
 				cl(r(0, 0, 0, 0), " (with file association)", OPEN_URI));
 	}
 
+	@Test
+	public void referencedGrammarUsingFileAssociationEmptyDocument() throws BadLocationException {
+		Consumer<XMLLanguageService> configuration = ls -> {
+			ContentModelManager contentModelManager = ls.getComponent(ContentModelManager.class);
+			// Use root URI which ends with slash
+			contentModelManager.setRootURI("src/test/resources/xsd/");
+			contentModelManager.setFileAssociations(createXSDAssociationsNoNamespaceSchemaLocationLike(""));
+		};
+
+		String xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>";
+
+		testCodeLensFor(xml, "file:///test/resources.xml", new XMLLanguageService(), //
+				Collections.singletonList(CodeLensKind.OpenUri), //
+				configuration, //
+				cl(r(0, 0, 0, 0), " (with file association)", OPEN_URI));
+
+		xml = "";
+
+		testCodeLensFor(xml, "file:///test/resources.xml", new XMLLanguageService(), //
+				Collections.singletonList(CodeLensKind.OpenUri), //
+				configuration, //
+				cl(r(0, 0, 0, 0), " (with file association)", OPEN_URI));
+	}
+
 	private static XMLFileAssociation[] createXSDAssociationsNoNamespaceSchemaLocationLike(String baseSystemId) {
 		XMLFileAssociation resources = new XMLFileAssociation();
 		resources.setPattern("**/*resources*.xml");