diff --git a/org.eclipse.lsp4xml/src/main/java/org/eclipse/lsp4xml/extensions/contentmodel/participants/XMLSyntaxErrorCode.java b/org.eclipse.lsp4xml/src/main/java/org/eclipse/lsp4xml/extensions/contentmodel/participants/XMLSyntaxErrorCode.java
index ccea5db4d4..0e2a07c5da 100644
--- a/org.eclipse.lsp4xml/src/main/java/org/eclipse/lsp4xml/extensions/contentmodel/participants/XMLSyntaxErrorCode.java
+++ b/org.eclipse.lsp4xml/src/main/java/org/eclipse/lsp4xml/extensions/contentmodel/participants/XMLSyntaxErrorCode.java
@@ -47,7 +47,7 @@ EqRequiredInAttribute, the_element_type_lmsg("the-element-type-lmsg"), EqRequire
 	InvalidCommentStart, LessthanInAttValue, MarkupEntityMismatch, MarkupNotRecognizedInContent,
 	NameRequiredInReference, OpenQuoteExpected, PITargetRequired, PseudoAttrNameExpected, QuoteRequiredInXMLDecl,
 	SDDeclInvalid, SpaceRequiredBeforeEncodingInXMLDecl, SpaceRequiredBeforeStandalone, SpaceRequiredInPI,
-	VersionInfoRequired, VersionNotSupported, XMLDeclUnterminated, CustomETag; // https://wiki.xmldation.com/Support/Validator/EqRequiredInAttribute
+	VersionInfoRequired, VersionNotSupported, XMLDeclUnterminated, CustomETag, PrematureEOF; // https://wiki.xmldation.com/Support/Validator/EqRequiredInAttribute
 
 	private final String code;
 
@@ -173,6 +173,7 @@ public static Range toLSPRange(XMLLocator location, XMLSyntaxErrorCode code, Obj
 			int start = selectCurrentTagOffset(offset, document) + 1;
 			int end = offset + 1;
 			return XMLPositionUtility.createRange(start, end, document);
+		case PrematureEOF:
 		case XMLDeclUnterminated:
 			break;
 		default:
diff --git a/org.eclipse.lsp4xml/src/main/java/org/eclipse/lsp4xml/services/extensions/diagnostics/AbstractLSPErrorReporter.java b/org.eclipse.lsp4xml/src/main/java/org/eclipse/lsp4xml/services/extensions/diagnostics/AbstractLSPErrorReporter.java
index 00ed8360c5..18f1999e93 100644
--- a/org.eclipse.lsp4xml/src/main/java/org/eclipse/lsp4xml/services/extensions/diagnostics/AbstractLSPErrorReporter.java
+++ b/org.eclipse.lsp4xml/src/main/java/org/eclipse/lsp4xml/services/extensions/diagnostics/AbstractLSPErrorReporter.java
@@ -77,8 +77,13 @@ public String reportError(XMLLocator location, String domain, String key, Object
 			message = str.toString();
 		}
 
+		Range adjustedRange = internalToLSPRange(location, key, arguments, xmlDocument);
+
+		if(adjustedRange == null) {
+			return null;
+		}
 		// Fill diagnostic
-		diagnostics.add(new Diagnostic(internalToLSPRange(location, key, arguments, xmlDocument), message,
+		diagnostics.add(new Diagnostic(adjustedRange, message,
 				toLSPSeverity(severity), source, key));
 
 		if (severity == SEVERITY_FATAL_ERROR && !fContinueAfterFatalError) {
@@ -127,6 +132,10 @@ private Range internalToLSPRange(XMLLocator location, String key, Object[] argum
 		int startOffset = location.getCharacterOffset() - 1;
 		int endOffset = location.getCharacterOffset() - 1;
 
+		if(startOffset < 0 || endOffset < 0) {
+			return null;
+		}
+
 		// Create LSP range
 		Position start = toLSPPosition(startOffset, location, document.getTextDocument());
 		Position end = toLSPPosition(endOffset, location, document.getTextDocument());
diff --git a/org.eclipse.lsp4xml/src/test/java/org/eclipse/lsp4xml/XMLAssert.java b/org.eclipse.lsp4xml/src/test/java/org/eclipse/lsp4xml/XMLAssert.java
index 03e59a4fc2..88aedfca26 100644
--- a/org.eclipse.lsp4xml/src/test/java/org/eclipse/lsp4xml/XMLAssert.java
+++ b/org.eclipse.lsp4xml/src/test/java/org/eclipse/lsp4xml/XMLAssert.java
@@ -10,6 +10,8 @@
  */
 package org.eclipse.lsp4xml;
 
+import static org.junit.Assert.assertTrue;
+
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.util.ArrayList;
@@ -280,7 +282,10 @@ public static void testDiagnosticsFor(String xml, String catalogPath, Consumer<X
 
 		List<Diagnostic> actual = xmlLanguageService.doDiagnostics(xmlDocument, () -> {
 		}, settings.getValidation());
-		
+		if(expected == null) {
+			assertTrue(actual.isEmpty());
+			return;
+		}
 		assertDiagnostics(actual, Arrays.asList(expected), filter);
 	}
 
diff --git a/org.eclipse.lsp4xml/src/test/java/org/eclipse/lsp4xml/extensions/contentmodel/XMLSchemaDiagnosticsTest.java b/org.eclipse.lsp4xml/src/test/java/org/eclipse/lsp4xml/extensions/contentmodel/XMLSchemaDiagnosticsTest.java
index 58f9045e3c..ef4c939e26 100644
--- a/org.eclipse.lsp4xml/src/test/java/org/eclipse/lsp4xml/extensions/contentmodel/XMLSchemaDiagnosticsTest.java
+++ b/org.eclipse.lsp4xml/src/test/java/org/eclipse/lsp4xml/extensions/contentmodel/XMLSchemaDiagnosticsTest.java
@@ -27,6 +27,18 @@
  */
 public class XMLSchemaDiagnosticsTest {
 
+	@Test
+	public void prematureEOFError() throws Exception {
+		String xml = " ";
+		testDiagnosticsFor(xml);
+	}
+
+	@Test
+	public void prematureEOFErrorWithProlog() throws Exception {
+		String xml = "<?xml version=\"1.0\" encoding=\"UTF-8\" ?> ";
+		testDiagnosticsFor(xml);
+	}
+
 	@Test
 	public void cvc_complex_type_2_3() throws Exception {
 		String xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\r\n" + //