diff --git a/core/src/main/kotlin/org/evomaster/core/problem/rest/oracle/RestSecurityOracle.kt b/core/src/main/kotlin/org/evomaster/core/problem/rest/oracle/RestSecurityOracle.kt
index 97616f397c..71e73d682e 100644
--- a/core/src/main/kotlin/org/evomaster/core/problem/rest/oracle/RestSecurityOracle.kt
+++ b/core/src/main/kotlin/org/evomaster/core/problem/rest/oracle/RestSecurityOracle.kt
@@ -457,7 +457,15 @@ class RestSecurityOracle {
 
         for(index in individual.seeMainExecutableActions().indices){
             val a = individual.seeMainExecutableActions()[index]
-            val r = actionResults.find { it.sourceLocalId == a.getLocalId() } as RestCallResult
+            val r = actionResults.find { it.sourceLocalId == a.getLocalId() } as RestCallResult?
+                /*
+                    FIXME either we check every "as RestCallResult" cast in this class, or
+                    we need to refactor how we pass around "individual" and "actionResults".
+                    TODO need refactoring
+                    TODO need invariant checks (eg if RestCallResult is missing, what property
+                     like "stopped" must be in the individual?)
+                 */
+                ?: break
 
             if((a.verb == HttpVerb.PUT || a.verb == HttpVerb.PATCH || a.verb == HttpVerb.DELETE)
                 && faultyPaths.contains(a.path)
diff --git a/core/src/main/kotlin/org/evomaster/core/search/gene/datetime/DateGene.kt b/core/src/main/kotlin/org/evomaster/core/search/gene/datetime/DateGene.kt
index 82c466918a..b13d7382e6 100644
--- a/core/src/main/kotlin/org/evomaster/core/search/gene/datetime/DateGene.kt
+++ b/core/src/main/kotlin/org/evomaster/core/search/gene/datetime/DateGene.kt
@@ -112,9 +112,14 @@ class DateGene(
         extraCheck: Boolean
     ): String {
         return if (mode == GeneUtils.EscapeMode.EJSON) {
-            val millis = LocalDate.of(year.value, month.value, day.value).atStartOfDay().atZone(ZoneId.systemDefault())
-                .toInstant().toEpochMilli()
-            "{\"\$date\":{\"\$numberLong\":\"$millis\"}}"
+            val millis = try{
+                LocalDate.of(year.value, month.value, day.value).atStartOfDay().atZone(ZoneId.systemDefault())
+                    .toInstant().toEpochMilli()
+            }catch (e : Exception){
+                //this can happen if date is invalid
+                -1
+            }
+            $$"{\"$date\":{\"$numberLong\":\"$$millis\"}}"
         } else {
             "\"${getValueAsRawString()}\""
         }