diff --git a/app.py b/app.py
index 3f68e58..c32f4dd 100644
--- a/app.py
+++ b/app.py
@@ -205,6 +205,7 @@ def get_timeseries(phase_id):
             datetime.fromisoformat(end_param.replace("Z", "+00:00"))
         except Exception:
             return api_error(400, "bad_datetime", "start/end must be ISO 8601")
+
         time_filter = f"time >= '{start_param}' AND time <= '{end_param}'"
         interval = config.DEFAULT_INTERVAL
     else:
@@ -213,6 +214,7 @@ def get_timeseries(phase_id):
             parse_range(clean_range)
         except Exception:
             return api_error(400, "bad_range", "range must be like 24h or 7d")
+
         time_filter = f"time > now() - {clean_range}"
         interval = config.TIME_RANGES.get(range_param, {}).get("interval", config.DEFAULT_INTERVAL)
 
@@ -221,17 +223,21 @@ def get_timeseries(phase_id):
         FROM "{config.MEASUREMENT}"
         WHERE "entity_id" = '{entity_id}'
         AND {time_filter}
-        GROUP BY time({interval}) fill(none)
+        GROUP BY time({interval}) fill(null)
     '''
 
     client = get_influx_client()
     try:
         result = client.query(query)
-        data = [
-            {"time": p["time"], "voltage": round(p["voltage"], 2)}
-            for p in result.get_points()
-            if p.get("voltage") is not None
-        ]
+        data = []
+        for p in result.get_points():
+            v = p.get("voltage")
+            data.append(
+                {
+                    "time": p["time"],
+                    "voltage": (round(float(v), 2) if v is not None else None),
+                }
+            )
         return jsonify(data)
     except Exception as e:
         app.logger.error(f"Timeseries Error: {e} | Query: {query}")
diff --git a/static/js/chart.js b/static/js/chart.js
index b3b873e..375a91c 100644
--- a/static/js/chart.js
+++ b/static/js/chart.js
@@ -82,7 +82,7 @@ window.setupMainChart = function setupMainChart() {
         legend: {
           labels: {
             color: '#c9d1d9',
-            filter: (item) => !['Zanik', 'Powrot', 'Awaria'].some(word => item.text.includes(word))
+            filter: (item) => !['Zanik', 'Powrot', 'Awaria', 'Brak danych'].some(word => item.text.includes(word))
           }
         },
         tooltip: {
diff --git a/static/js/data.js b/static/js/data.js
index 0652de0..58421ee 100644
--- a/static/js/data.js
+++ b/static/js/data.js
@@ -1,35 +1,73 @@
 window.processPhaseData = function processPhaseData(id, data) {
   const lineData = [];
-  const outagePoints = [];
   const recoveryPoints = [];
   const outageLineData = [];
+
+  const gapBars = [];
+  const outageBars = [];
+
   let wasOutage = false;
 
+  const Y_TOP = 255; 
+  const GAP_BAR_VALUE = Y_TOP;
+  const OUT_BAR_VALUE = Y_TOP;
+
   data.forEach(p => {
     const v = p.voltage;
     const t = new Date(p.time);
 
-    if (v < 180 && v !== null) {
-      const pOut = { x: t, y: 195, realV: v };
-      outagePoints.push(pOut);
-      outageLineData.push(pOut);
+    if (v === null || v === undefined) {
+      lineData.push({ x: t, y: null });
+      outageLineData.push({ x: t, y: null });
+      gapBars.push({ x: t, y: GAP_BAR_VALUE });
+      return;
+    }
+
+    if (v < 180) {
+      outageBars.push({ x: t, y: OUT_BAR_VALUE });
 
       lineData.push({ x: t, y: null });
+      outageLineData.push({ x: t, y: 195, realV: v });
+
       wasOutage = true;
-    } else {
-      if (wasOutage) {
-        const pRec = { x: t, y: v, realV: v };
-        recoveryPoints.push(pRec);
-        outageLineData.push(pRec);
-        wasOutage = false;
-      } else {
-        outageLineData.push({ x: t, y: null });
-      }
-      lineData.push({ x: t, y: v });
+      return;
     }
+
+    if (wasOutage) {
+      const pRec = { x: t, y: v, realV: v };
+      recoveryPoints.push(pRec);
+      outageLineData.push(pRec);
+      wasOutage = false;
+    } else {
+      outageLineData.push({ x: t, y: null });
+    }
+
+    lineData.push({ x: t, y: v });
   });
 
   return {
+    gapDataset: gapBars.length ? {
+      type: 'bar',
+      label: 'Brak danych ' + window.phasesConfig[id].label,
+      data: gapBars,
+      backgroundColor: 'rgba(160,160,160,0.14)',
+      borderWidth: 0,
+      barPercentage: 1.0,
+      categoryPercentage: 1.0,
+      order: -50
+    } : null,
+
+    outageShadeDataset: outageBars.length ? {
+      type: 'bar',
+      label: 'Zanik ' + window.phasesConfig[id].label,
+      data: outageBars,
+      backgroundColor: 'rgba(255,0,0,0.10)',
+      borderWidth: 0,
+      barPercentage: 1.0,
+      categoryPercentage: 1.0,
+      order: -40
+    } : null,
+
     lineDataset: {
       label: window.phasesConfig[id].label,
       data: lineData,
@@ -38,8 +76,10 @@ window.processPhaseData = function processPhaseData(id, data) {
       tension: 0.1,
       borderWidth: 2,
       spanGaps: false,
-      pointRadius: 0
+      pointRadius: 0,
+      order: 0
     },
+
     outageLine: {
       label: 'Awaria ' + window.phasesConfig[id].label,
       data: outageLineData,
@@ -49,18 +89,10 @@ window.processPhaseData = function processPhaseData(id, data) {
       pointRadius: 0,
       fill: false,
       spanGaps: false,
-      showLine: true
+      showLine: true,
+      order: 1
     },
-    outageDataset: outagePoints.length ? {
-      label: 'Zanik ' + window.phasesConfig[id].label,
-      data: outagePoints,
-      type: 'scatter',
-      pointRadius: 4,
-      pointBackgroundColor: '#ff0000',
-      pointBorderColor: '#fff',
-      pointBorderWidth: 1,
-      z: 99
-    } : null,
+
     recoveryDataset: recoveryPoints.length ? {
       label: 'Powrot ' + window.phasesConfig[id].label,
       data: recoveryPoints,
@@ -69,7 +101,8 @@ window.processPhaseData = function processPhaseData(id, data) {
       pointBackgroundColor: '#3fb950',
       pointBorderColor: '#fff',
       pointBorderWidth: 1,
-      z: 99
+      z: 99,
+      order: 11
     } : null
   };
 };
@@ -89,6 +122,11 @@ window.reloadDataForRange = async function reloadDataForRange(min, max, rangeNam
     try {
       const raw = await fetch(`/api/timeseries/${id}?${urlParams}`).then(r => r.json());
       const proc = window.processPhaseData(id, raw);
+
+      if (proc.gapDataset) newDatasets.push(proc.gapDataset);
+      if (proc.outageShadeDataset) newDatasets.push(proc.outageShadeDataset);
+
+
       newDatasets.push(proc.lineDataset);
       if (proc.outageLine) newDatasets.push(proc.outageLine);
       if (proc.outageDataset) newDatasets.push(proc.outageDataset);