diff --git a/playwright/src/main/java/com/microsoft/playwright/impl/AssertionsBase.java b/playwright/src/main/java/com/microsoft/playwright/impl/AssertionsBase.java
index 9c00602d..ff348a3d 100644
--- a/playwright/src/main/java/com/microsoft/playwright/impl/AssertionsBase.java
+++ b/playwright/src/main/java/com/microsoft/playwright/impl/AssertionsBase.java
@@ -47,7 +47,6 @@ void expectImpl(String expression, List<ExpectedTextValue> expectedText, Object
       options = new FrameExpectOptions();
     }
     options.expectedText = expectedText;
-    options.isNot = isNot;
     expectImpl(expression, options, expected, message);
   }
 
@@ -55,13 +54,14 @@ void expectImpl(String expression, FrameExpectOptions expectOptions, Object expe
     if (expectOptions.timeout == null) {
       expectOptions.timeout = AssertionsTimeout.defaultTimeout;
     }
-    if (expectOptions.isNot) {
+    expectOptions.isNot = isNot;
+    if (isNot) {
       message = message.replace("expected to", "expected not to");
     }
     FrameExpectResult result = actualLocator.expect(expression, expectOptions);
     if (result.matches == isNot) {
       Object actual = result.received == null ? null : Serialization.deserialize(result.received);
-      String log = String.join("\n", result.log);
+      String log = (result.log == null) ? "" : String.join("\n", result.log);
       if (!log.isEmpty()) {
         log = "\nCall log:\n" + log;
       }
diff --git a/playwright/src/test/java/com/microsoft/playwright/TestLocatorAssertions.java b/playwright/src/test/java/com/microsoft/playwright/TestLocatorAssertions.java
index 3a248062..ff7b7c71 100644
--- a/playwright/src/test/java/com/microsoft/playwright/TestLocatorAssertions.java
+++ b/playwright/src/test/java/com/microsoft/playwright/TestLocatorAssertions.java
@@ -20,6 +20,7 @@
 import com.microsoft.playwright.assertions.PlaywrightAssertions;
 import org.junit.jupiter.api.Test;
 import org.opentest4j.AssertionFailedError;
+import org.opentest4j.ValueWrapper;
 
 import java.util.regex.Pattern;
 
@@ -656,9 +657,9 @@ void isCheckedFail() {
     AssertionFailedError e = assertThrows(AssertionFailedError.class, () -> {
       assertThat(locator).isChecked(new LocatorAssertions.IsCheckedOptions().setTimeout(1000));
     });
-    assertNull(e.getExpected());
-    assertNull(e.getActual());
-    assertTrue(e.getMessage().contains("Locator expected to be checked"), e.getMessage());
+    assertEquals("checked", e.getExpected().getStringRepresentation());
+    assertEquals("unchecked", e.getActual().getStringRepresentation());
+    assertTrue(e.getMessage().contains("Locator expected to be: checked"), e.getMessage());
   }
 
   @Test
@@ -668,9 +669,10 @@ void notIsCheckedFail() {
     AssertionFailedError e = assertThrows(AssertionFailedError.class, () -> {
       assertThat(locator).not().isChecked(new LocatorAssertions.IsCheckedOptions().setTimeout(1000));
     });
-    assertNull(e.getExpected());
-    assertNull(e.getActual());
-    assertTrue(e.getMessage().contains("Locator expected not to be checked"), e.getMessage());
+
+    assertEquals("checked", e.getExpected().getStringRepresentation());
+    assertEquals("checked", e.getActual().getStringRepresentation());
+    assertTrue(e.getMessage().contains("Locator expected not to be: checked"), e.getMessage());
   }
 
   @Test
@@ -686,7 +688,7 @@ void isCheckedFalseFail() {
     Locator locator = page.locator("input");
     AssertionFailedError error = assertThrows(AssertionFailedError.class,
       () -> assertThat(locator).isChecked(new LocatorAssertions.IsCheckedOptions().setChecked(false).setTimeout(1000)));
-    assertTrue(error.getMessage().contains("Locator expected to be unchecked"), error.getMessage());
+    assertTrue(error.getMessage().contains("Locator expected to be: unchecked"), error.getMessage());
   }
 
   @Test