diff --git a/custom_components/tibber_prices/services/get_chartdata.py b/custom_components/tibber_prices/services/get_chartdata.py
index 0b1692c..cbb0b5e 100644
--- a/custom_components/tibber_prices/services/get_chartdata.py
+++ b/custom_components/tibber_prices/services/get_chartdata.py
@@ -399,9 +399,9 @@ async def handle_chartdata(call: ServiceCall) -> dict[str, Any]:  # noqa: PLR091
             translation_key="level_and_rating_filter_conflict",
         )
 
-    has_filter = bool(level_filter or rating_level_filter)
+    has_filter = bool(level_filter or rating_level_filter or period_filter)
 
-    # insert_nulls modes "segments"/"all" require a level or rating filter
+    # insert_nulls modes "segments"/"all" require a level, rating, or period filter
     if insert_nulls != "none" and not has_filter:
         raise ServiceValidationError(
             translation_domain=DOMAIN,
diff --git a/custom_components/tibber_prices/translations/de.json b/custom_components/tibber_prices/translations/de.json
index de2a6ac..457bad9 100644
--- a/custom_components/tibber_prices/translations/de.json
+++ b/custom_components/tibber_prices/translations/de.json
@@ -1199,7 +1199,7 @@
       "message": "level_filter und rating_level_filter können nicht gleichzeitig verwendet werden. Verwende nur einen Filtertyp pro Anfrage."
     },
     "insert_nulls_requires_filter": {
-      "message": "insert_nulls-Modus {mode} erfordert einen level_filter oder rating_level_filter zur Segmentdefinition. Ohne Filter verwende insert_nulls: none."
+      "message": "insert_nulls-Modus {mode} erfordert einen level_filter, rating_level_filter oder period_filter zur Segmentdefinition. Ohne Filter verwende insert_nulls: none."
     },
     "connect_segments_requires_segments_mode": {
       "message": "connect_segments erfordert, dass insert_nulls auf 'segments' gesetzt ist. Setze insert_nulls: segments, um Segmentverbindung zu nutzen."
diff --git a/custom_components/tibber_prices/translations/en.json b/custom_components/tibber_prices/translations/en.json
index 0001f59..59e3f29 100644
--- a/custom_components/tibber_prices/translations/en.json
+++ b/custom_components/tibber_prices/translations/en.json
@@ -1199,7 +1199,7 @@
       "message": "level_filter and rating_level_filter cannot be used together. Use only one filter type per request."
     },
     "insert_nulls_requires_filter": {
-      "message": "insert_nulls mode {mode} requires a level_filter or rating_level_filter to define segments. Without a filter, use insert_nulls: none."
+      "message": "insert_nulls mode {mode} requires a level_filter, rating_level_filter, or period_filter to define segments. Without a filter, use insert_nulls: none."
     },
     "connect_segments_requires_segments_mode": {
       "message": "connect_segments requires insert_nulls to be set to 'segments'. Set insert_nulls: segments to use segment connection."
diff --git a/custom_components/tibber_prices/translations/nb.json b/custom_components/tibber_prices/translations/nb.json
index a719840..a17c4ed 100644
--- a/custom_components/tibber_prices/translations/nb.json
+++ b/custom_components/tibber_prices/translations/nb.json
@@ -1199,7 +1199,7 @@
       "message": "level_filter og rating_level_filter kan ikke brukes sammen. Bruk kun én filtertype per forespørsel."
     },
     "insert_nulls_requires_filter": {
-      "message": "insert_nulls-modus {mode} krever en level_filter eller rating_level_filter for å definere segmenter. Uten filter, bruk insert_nulls: none."
+      "message": "insert_nulls-modus {mode} krever en level_filter, rating_level_filter eller period_filter for å definere segmenter. Uten filter, bruk insert_nulls: none."
     },
     "connect_segments_requires_segments_mode": {
       "message": "connect_segments krever at insert_nulls er satt til 'segments'. Sett insert_nulls: segments for å bruke segmentforbindelse."
diff --git a/custom_components/tibber_prices/translations/nl.json b/custom_components/tibber_prices/translations/nl.json
index 2db0e9b..a2be03b 100644
--- a/custom_components/tibber_prices/translations/nl.json
+++ b/custom_components/tibber_prices/translations/nl.json
@@ -1199,7 +1199,7 @@
       "message": "level_filter en rating_level_filter kunnen niet samen gebruikt worden. Gebruik slechts één filtertype per verzoek."
     },
     "insert_nulls_requires_filter": {
-      "message": "insert_nulls-modus {mode} vereist een level_filter of rating_level_filter om segmenten te definiëren. Zonder filter, gebruik insert_nulls: none."
+      "message": "insert_nulls-modus {mode} vereist een level_filter, rating_level_filter of period_filter om segmenten te definiëren. Zonder filter, gebruik insert_nulls: none."
     },
     "connect_segments_requires_segments_mode": {
       "message": "connect_segments vereist dat insert_nulls op 'segments' staat. Stel insert_nulls: segments in om segmentverbinding te gebruiken."
diff --git a/custom_components/tibber_prices/translations/sv.json b/custom_components/tibber_prices/translations/sv.json
index beb2757..a827fc6 100644
--- a/custom_components/tibber_prices/translations/sv.json
+++ b/custom_components/tibber_prices/translations/sv.json
@@ -1199,7 +1199,7 @@
       "message": "level_filter och rating_level_filter kan inte användas tillsammans. Använd bara en filtertyp per begäran."
     },
     "insert_nulls_requires_filter": {
-      "message": "insert_nulls-läge {mode} kräver ett level_filter eller rating_level_filter för att definiera segment. Utan filter, använd insert_nulls: none."
+      "message": "insert_nulls-läge {mode} kräver ett level_filter, rating_level_filter eller period_filter för att definiera segment. Utan filter, använd insert_nulls: none."
     },
     "connect_segments_requires_segments_mode": {
       "message": "connect_segments kräver att insert_nulls är satt till 'segments'. Ställ in insert_nulls: segments för att använda segmentanslutning."