diff --git a/headless-services/bosh-language-server/src/test/java/org/springframework/ide/vscode/bosh/BoshEditorTest.java b/headless-services/bosh-language-server/src/test/java/org/springframework/ide/vscode/bosh/BoshEditorTest.java
index f88af74a6..07a602e44 100644
--- a/headless-services/bosh-language-server/src/test/java/org/springframework/ide/vscode/bosh/BoshEditorTest.java
+++ b/headless-services/bosh-language-server/src/test/java/org/springframework/ide/vscode/bosh/BoshEditorTest.java
@@ -1591,4 +1591,21 @@ public class BoshEditorTest {
 		);
 	}
 
+	@Test public void bug_149769913() throws Exception {
+		Editor editor = harness.newEditor(
+				"releases:\n" +
+				"- name: learn-bosh\n" +
+				"  url: file:///blah\n" +
+				"  version:\n" +
+				"- name: blah-blah\n" +
+				"  version:"
+		);
+		editor.ignoreProblem(YamlSchemaProblems.MISSING_PROPERTY);
+
+		editor.assertProblems(
+				"version:^^|cannot be blank",
+				"version:^^|cannot be blank"
+		);
+	}
+
 }
diff --git a/headless-services/commons/commons-util/src/main/java/org/springframework/ide/vscode/commons/util/EnumValueParser.java b/headless-services/commons/commons-util/src/main/java/org/springframework/ide/vscode/commons/util/EnumValueParser.java
index 52856e0d5..38f0f7638 100644
--- a/headless-services/commons/commons-util/src/main/java/org/springframework/ide/vscode/commons/util/EnumValueParser.java
+++ b/headless-services/commons/commons-util/src/main/java/org/springframework/ide/vscode/commons/util/EnumValueParser.java
@@ -53,6 +53,10 @@ public class EnumValueParser implements ValueParser {
 		this.values = values;
 	}
 
+	public EnumValueParser(String name, PartialCollection<String> values) {
+		this(name, () -> values);
+	}
+
 	@Override
 	public Object parse(String str) throws Exception {
 		// IMPORTANT: check the text FIRST before fetching values
diff --git a/headless-services/commons/commons-util/src/main/java/org/springframework/ide/vscode/commons/util/PartialCollection.java b/headless-services/commons/commons-util/src/main/java/org/springframework/ide/vscode/commons/util/PartialCollection.java
index 3b0ddc065..93efa7477 100644
--- a/headless-services/commons/commons-util/src/main/java/org/springframework/ide/vscode/commons/util/PartialCollection.java
+++ b/headless-services/commons/commons-util/src/main/java/org/springframework/ide/vscode/commons/util/PartialCollection.java
@@ -68,6 +68,20 @@ public class PartialCollection<T> {
 			return new PartialCollection<>(ImmutableSet.of(), e);
 		}
 	}
+	
+	/**
+	 * Create a {@link PartialCollection} by executing some computation that returs a collectioon. 
+	 * If the computation throws the resulting collection will be completely unknown, otherwise
+	 * it will be completely known.
+	 */
+	public static <T> PartialCollection<T> fromCallable(Callable<PartialCollection<T>> computer) {
+		try {
+			return computer.call();
+		} catch (Exception e) {
+			return new PartialCollection<>(ImmutableSet.of(), e);
+		}
+	}
+
 
 	/**
 	 * @return All the known elements of this partial collection.
diff --git a/headless-services/commons/commons-yaml/src/main/java/org/springframework/ide/vscode/commons/yaml/schema/YTypeFactory.java b/headless-services/commons/commons-yaml/src/main/java/org/springframework/ide/vscode/commons/yaml/schema/YTypeFactory.java
index dec12c1c9..54227bd14 100644
--- a/headless-services/commons/commons-yaml/src/main/java/org/springframework/ide/vscode/commons/yaml/schema/YTypeFactory.java
+++ b/headless-services/commons/commons-yaml/src/main/java/org/springframework/ide/vscode/commons/yaml/schema/YTypeFactory.java
@@ -859,21 +859,17 @@ public class YTypeFactory {
 		YAtomicType t = yatomic(name);
 		t.setHintProvider(values);
 		t.parseWith((DynamicSchemaContext dc) -> {
-			PartialCollection<YValueHint> hints = values.withContext(dc);
-			if (hints.isComplete()) {
-				Collection<String> strings = values(hints.getElements());
-				return new EnumValueParser(name, strings) {
-					@Override
-					protected String createErrorMessage(String parseString, Collection<String> values) {
-						try {
-							return errorMessageFormatter.withContext(dc).apply(parseString, values);
-						} catch (Exception e) {
-							return super.createErrorMessage(parseString, values);
-						}
+			PartialCollection<YValueHint> hints = PartialCollection.fromCallable(() -> values.withContext(dc));
+			return new EnumValueParser(name, hints.map(h -> h.getValue())) {
+				@Override
+				protected String createErrorMessage(String parseString, Collection<String> values) {
+					try {
+						return errorMessageFormatter.withContext(dc).apply(parseString, values);
+					} catch (Exception e) {
+						return super.createErrorMessage(parseString, values);
 					}
-				};
-			}
-			return null;
+				}
+			};
 		});
 		return t;
 	}