diff --git a/lib/org-rules.cjs b/lib/org-rules.cjs
index 9b3802c..cb424bf 100644
--- a/lib/org-rules.cjs
+++ b/lib/org-rules.cjs
@@ -187,7 +187,7 @@ const selectionForTags = (tags, serviceDefinition) => {
 
 const caseSensitiveFieldListMatch =
   (fieldName) => (value, serviceDefinition) => {
-    if (value.toLocaleLowerCase() === 'all') {
+    if (value?.toLocaleLowerCase() === 'all') {
       !!_.get(serviceDefinition, fieldName, undefined)
     }
     if (!Array.isArray(value)) {
@@ -210,7 +210,7 @@ const caseSensitiveFieldListMatch =
  * @function
  **/
 const caseInsensitiveFieldMatch = (fieldName) => (value, serviceDefinition) =>
-  value.toLocaleLowerCase() ===
+  value?.toLocaleLowerCase() ===
   serviceDefinition?.[fieldName]?.toLocaleLowerCase()
 
 /**
@@ -239,7 +239,7 @@ const determineApplicabilityOfRule = (rule, serviceDescription) => {
 
   if (!selectionCriteria) return false
 
-  if (`${selectionCriteria}`.toLocaleLowerCase() === 'all') return true
+  if (`${selectionCriteria}`?.toLocaleLowerCase() === 'all') return true
 
   // Find all of the criteria which fail.
   const failingCriteria = _.filter(selectionCriteria, (value, key) => {
@@ -330,7 +330,7 @@ const makeComplianceCheck_valueMatchAndCount = (
     if (
       permittedValues.length &&
       !sd_list.find((value) =>
-        _.includes(permittedValues, matchField_sd(value).toLocaleLowerCase()),
+        _.includes(permittedValues, matchField_sd(value)?.toLocaleLowerCase()),
       )
     ) {
       return false
@@ -355,7 +355,7 @@ const makeSimpleStringFieldComplianceChecker =
     // Support `any`
     if (
       !Array.isArray(requirement) &&
-      requirement.toLocaleLowerCase() === 'any'
+      requirement?.toLocaleLowerCase() === 'any'
     ) {
       return !!_.get(serviceDefinition, fieldName, undefined)
     }