diff --git a/ogc/bblocks/validate.py b/ogc/bblocks/validate.py
index 9d5a837..87ca32c 100644
--- a/ogc/bblocks/validate.py
+++ b/ogc/bblocks/validate.py
@@ -185,7 +185,7 @@ def _validate_resource(bblock: BuildingBlock,
                                         base_uri=base_uri,
                                         additional_shacl_closures=additional_shacl_closures,
                                         schema_ref=schema_ref)
-            any_validator_run = any_validator_run or (result is not None)
+            any_validator_run = any_validator_run or (result is not False)
 
     except Exception as unknown_exc:
         report.add_entry(ValidationReportEntry(
diff --git a/ogc/bblocks/validation/__init__.py b/ogc/bblocks/validation/__init__.py
index 38d448b..a87d5ac 100644
--- a/ogc/bblocks/validation/__init__.py
+++ b/ogc/bblocks/validation/__init__.py
@@ -23,7 +23,7 @@ def validate(self, filename: Path, output_filename: Path,
                  base_uri: str | None = None,
                  resource_url: str | None = None,
                  require_fail: bool | None = None,
-                 **kwargs) -> ValidationReportItem | None:
+                 **kwargs) -> bool | None:
         raise NotImplementedError
 
 
diff --git a/ogc/bblocks/validation/json_.py b/ogc/bblocks/validation/json_.py
index 37342d9..a5f7388 100644
--- a/ogc/bblocks/validation/json_.py
+++ b/ogc/bblocks/validation/json_.py
@@ -88,10 +88,10 @@ def __init__(self, bblock: BuildingBlock, register: BuildingBlockRegister):
     def validate(self, filename: Path, output_filename: Path, report: ValidationReportItem,
                  contents: str | None = None,
                  schema_ref: str | None = None,
-                 **kwargs) -> ValidationReportItem | None:
+                 **kwargs) -> bool | None:
 
         if filename.suffix not in ('.json', '.jsonld', '.yaml', '.yml'):
-            return
+            return False
 
         file_from = 'examples' if report.source.type == ValidationItemSourceType.EXAMPLE else 'test resources'
 
@@ -232,5 +232,3 @@ def validate(self, filename: Path, output_filename: Path, report: ValidationRepo
                     'col': e.colno,
                 }
             ))
-
-        return report
diff --git a/ogc/bblocks/validation/rdf.py b/ogc/bblocks/validation/rdf.py
index 127f9ac..74ab399 100644
--- a/ogc/bblocks/validation/rdf.py
+++ b/ogc/bblocks/validation/rdf.py
@@ -269,11 +269,11 @@ def validate(self, filename: Path, output_filename: Path, report: ValidationRepo
                  contents: str | None = None,
                  base_uri: str | None = None,
                  additional_shacl_closures: list[str | Path] | None = None,
-                 **kwargs) -> ValidationReportItem | None:
+                 **kwargs) -> bool | None:
         graph = self._load_graph(filename, output_filename, report, contents, base_uri)
 
         if graph is None:
-            return
+            return False
 
         if graph is not None and (contents or filename.suffix != '.ttl'):
             try:
@@ -418,5 +418,3 @@ def validate(self, filename: Path, output_filename: Path, report: ValidationRepo
                             'shaclFile': str(shacl_file),
                         }
                     ))
-
-        return report