diff --git a/openapi-validation-core/src/main/java/com/getyourguide/openapi/validation/core/DefaultViolationLogger.java b/openapi-validation-core/src/main/java/com/getyourguide/openapi/validation/core/DefaultViolationLogger.java
index b7fb62a..e1445c5 100644
--- a/openapi-validation-core/src/main/java/com/getyourguide/openapi/validation/core/DefaultViolationLogger.java
+++ b/openapi-validation-core/src/main/java/com/getyourguide/openapi/validation/core/DefaultViolationLogger.java
@@ -25,7 +25,7 @@ public void log(OpenApiViolation violation) {
                 default -> { /* do nothing */ }
             }
         } catch (IOException e) {
-            log.error("Could not add to LoggingContext", e);
+            log.error("[OpenAPI Validation] Could not add to LoggingContext", e);
         }
     }
 
diff --git a/openapi-validation-core/src/main/java/com/getyourguide/openapi/validation/core/OpenApiInteractionValidatorFactory.java b/openapi-validation-core/src/main/java/com/getyourguide/openapi/validation/core/OpenApiInteractionValidatorFactory.java
index 3cb0529..5eb16ad 100644
--- a/openapi-validation-core/src/main/java/com/getyourguide/openapi/validation/core/OpenApiInteractionValidatorFactory.java
+++ b/openapi-validation-core/src/main/java/com/getyourguide/openapi/validation/core/OpenApiInteractionValidatorFactory.java
@@ -51,7 +51,7 @@ private MultipleSpecOpenApiInteractionValidatorWrapper buildMultipleSpecOpenApiI
                 var path = entry.specificationFilePath();
                 var specOptional = loadSpecFromPath(path).or(() -> loadSpecFromResources(path));
                 if (specOptional.isEmpty()) {
-                    log.error("OpenAPI spec file {} could not be found", path);
+                    log.error("[OpenAPI Validation] Spec file {} could not be found", path);
                     return null;
                 }
                 var validator = buildSingleSpecOpenApiInteractionValidatorWrapper(specOptional.get(),
@@ -69,6 +69,7 @@ private MultipleSpecOpenApiInteractionValidatorWrapper buildMultipleSpecOpenApiI
         return new MultipleSpecOpenApiInteractionValidatorWrapper(validators);
     }
 
+    @Nullable
     private SingleSpecOpenApiInteractionValidatorWrapper buildSingleSpecOpenApiInteractionValidatorWrapper(
         String spec,
         Map<String, LogLevel> levelResolverLevels,
@@ -84,7 +85,7 @@ private SingleSpecOpenApiInteractionValidatorWrapper buildSingleSpecOpenApiInter
                 .build();
             return new SingleSpecOpenApiInteractionValidatorWrapper(validator);
         } catch (Throwable e) {
-            log.error("Could not initialize OpenApiInteractionValidator [validation disabled]", e);
+            log.error("[OpenAPI Validation] Could not initialize OpenApiInteractionValidator [validation disabled]", e);
             return null;
         }
     }
diff --git a/openapi-validation-core/src/main/java/com/getyourguide/openapi/validation/core/OpenApiRequestValidator.java b/openapi-validation-core/src/main/java/com/getyourguide/openapi/validation/core/OpenApiRequestValidator.java
index 02e0aa0..1991fda 100644
--- a/openapi-validation-core/src/main/java/com/getyourguide/openapi/validation/core/OpenApiRequestValidator.java
+++ b/openapi-validation-core/src/main/java/com/getyourguide/openapi/validation/core/OpenApiRequestValidator.java
@@ -94,7 +94,7 @@ public List<OpenApiViolation> validateRequestObject(
             var result = validator.validateRequest(simpleRequest);
             return mapper.map(result, request, response, Direction.REQUEST, requestBody);
         } catch (Exception e) {
-            log.error("Could not validate request", e);
+            log.error("[OpenAPI Validation] Could not validate request", e);
             return List.of();
         }
     }
@@ -138,7 +138,7 @@ public List<OpenApiViolation> validateResponseObject(
             );
             return mapper.map(result, request, response, Direction.RESPONSE, responseBody);
         } catch (Exception e) {
-            log.error("Could not validate response", e);
+            log.error("[OpenAPI Validation] Could not validate response", e);
             return List.of();
         }
     }
diff --git a/openapi-validation-core/src/main/java/com/getyourguide/openapi/validation/core/validator/MultipleSpecOpenApiInteractionValidatorWrapper.java b/openapi-validation-core/src/main/java/com/getyourguide/openapi/validation/core/validator/MultipleSpecOpenApiInteractionValidatorWrapper.java
index 8ba1a49..ab6369b 100644
--- a/openapi-validation-core/src/main/java/com/getyourguide/openapi/validation/core/validator/MultipleSpecOpenApiInteractionValidatorWrapper.java
+++ b/openapi-validation-core/src/main/java/com/getyourguide/openapi/validation/core/validator/MultipleSpecOpenApiInteractionValidatorWrapper.java
@@ -40,7 +40,7 @@ public ValidationReport validateResponse(String path, Request.Method method, Sim
     private Optional<OpenApiInteractionValidatorWrapper> getValidatorForPath(String path) {
         for (var validator : validators) {
             if (validator.getLeft().matcher(path).matches()) {
-                return Optional.of(validator.getRight());
+                return validator.getRight() != null ? Optional.of(validator.getRight()) : Optional.empty();
             }
         }
 
diff --git a/openapi-validation-core/src/test/java/com/getyourguide/openapi/validation/core/validator/MultipleSpecOpenApiInteractionValidatorWrapperTest.java b/openapi-validation-core/src/test/java/com/getyourguide/openapi/validation/core/validator/MultipleSpecOpenApiInteractionValidatorWrapperTest.java
index df4de8b..f54f4f0 100644
--- a/openapi-validation-core/src/test/java/com/getyourguide/openapi/validation/core/validator/MultipleSpecOpenApiInteractionValidatorWrapperTest.java
+++ b/openapi-validation-core/src/test/java/com/getyourguide/openapi/validation/core/validator/MultipleSpecOpenApiInteractionValidatorWrapperTest.java
@@ -56,6 +56,27 @@ public void testReturnsViolationWhenNoMatchingValidatorFound() {
         assertEquals("ValidatorConfiguration has no spec file matching path: /123", message.getMessage());
     }
 
+    @Test
+    public void testReturnsViolationWhenMatchingValidatorIsNull() {
+        var catchAllValidator = mockValidator();
+
+        validator = new MultipleSpecOpenApiInteractionValidatorWrapper(
+            List.of(
+                Pair.of(Pattern.compile("/test/.*"), null),
+                Pair.of(Pattern.compile(".*"), catchAllValidator.validator())
+            )
+        );
+
+        var path = "/test/123";
+        var report = validator.validateRequest(new SimpleRequest.Builder("GET", path).build());
+
+        var messages = report.getMessages();
+        assertEquals(1, messages.size());
+        var message = messages.get(0);
+        assertEquals(MESSAGE_KEY_NO_VALIDATOR_FOUND, message.getKey());
+        assertEquals("ValidatorConfiguration has no spec file matching path: /test/123", message.getMessage());
+    }
+
     private static MockValidatorResult mockValidator() {
         var catchAllValidator = mock(OpenApiInteractionValidatorWrapper.class);
         var catchAllValidationReport = mock(ValidationReport.class);