diff --git a/api/core/model_runtime/entities/message_entities.py b/api/core/model_runtime/entities/message_entities.py
index 3ac83b4c96..9e46d72893 100644
--- a/api/core/model_runtime/entities/message_entities.py
+++ b/api/core/model_runtime/entities/message_entities.py
@@ -251,10 +251,7 @@ class AssistantPromptMessage(PromptMessage):
 
         :return: True if prompt message is empty, False otherwise
         """
-        if not super().is_empty() and not self.tool_calls:
-            return False
-
-        return True
+        return super().is_empty() and not self.tool_calls
 
 
 class SystemPromptMessage(PromptMessage):
diff --git a/web/app/components/base/amplitude/AmplitudeProvider.tsx b/web/app/components/base/amplitude/AmplitudeProvider.tsx
index 87ef516835..0f083a4a7d 100644
--- a/web/app/components/base/amplitude/AmplitudeProvider.tsx
+++ b/web/app/components/base/amplitude/AmplitudeProvider.tsx
@@ -54,7 +54,7 @@ const pageNameEnrichmentPlugin = (): amplitude.Types.EnrichmentPlugin => {
 }
 
 const AmplitudeProvider: FC<IAmplitudeProps> = ({
-  sessionReplaySampleRate = 1,
+  sessionReplaySampleRate = 0.5,
 }) => {
   useEffect(() => {
     // Only enable in Saas edition with valid API key
diff --git a/web/utils/format.spec.ts b/web/utils/format.spec.ts
index 0fde0ccbe8..3a1709dbdc 100644
--- a/web/utils/format.spec.ts
+++ b/web/utils/format.spec.ts
@@ -19,6 +19,28 @@ describe('formatNumber', () => {
   it('should correctly handle empty input', () => {
     expect(formatNumber('')).toBe('')
   })
+  it('should format very small numbers without scientific notation', () => {
+    expect(formatNumber(0.0000008)).toBe('0.0000008')
+    expect(formatNumber(0.0000001)).toBe('0.0000001')
+    expect(formatNumber(0.000001)).toBe('0.000001')
+    expect(formatNumber(0.00001)).toBe('0.00001')
+  })
+  it('should format negative small numbers without scientific notation', () => {
+    expect(formatNumber(-0.0000008)).toBe('-0.0000008')
+    expect(formatNumber(-0.0000001)).toBe('-0.0000001')
+  })
+  it('should handle small numbers from string input', () => {
+    expect(formatNumber('0.0000008')).toBe('0.0000008')
+    expect(formatNumber('8E-7')).toBe('0.0000008')
+    expect(formatNumber('1e-7')).toBe('0.0000001')
+  })
+  it('should handle small numbers with multi-digit mantissa in scientific notation', () => {
+    expect(formatNumber(1.23e-7)).toBe('0.000000123')
+    expect(formatNumber(1.234e-7)).toBe('0.0000001234')
+    expect(formatNumber(12.34e-7)).toBe('0.000001234')
+    expect(formatNumber(0.0001234)).toBe('0.0001234')
+    expect(formatNumber('1.23e-7')).toBe('0.000000123')
+  })
 })
 describe('formatFileSize', () => {
   it('should return the input if it is falsy', () => {
diff --git a/web/utils/format.ts b/web/utils/format.ts
index d087d690a2..0c81b339a3 100644
--- a/web/utils/format.ts
+++ b/web/utils/format.ts
@@ -26,11 +26,39 @@ import 'dayjs/locale/zh-tw'
  * Formats a number with comma separators.
  * @example formatNumber(1234567) will return '1,234,567'
  * @example formatNumber(1234567.89) will return '1,234,567.89'
+ * @example formatNumber(0.0000008) will return '0.0000008'
  */
 export const formatNumber = (num: number | string) => {
   if (!num)
     return num
-  const parts = num.toString().split('.')
+  const n = typeof num === 'string' ? Number(num) : num
+
+  let numStr: string
+
+  // Force fixed decimal for small numbers to avoid scientific notation
+  if (Math.abs(n) < 0.001 && n !== 0) {
+    const str = n.toString()
+    const match = str.match(/e-(\d+)$/)
+    let precision: number
+    if (match) {
+      // Scientific notation: precision is exponent + decimal digits in mantissa
+      const exponent = Number.parseInt(match[1], 10)
+      const mantissa = str.split('e')[0]
+      const mantissaDecimalPart = mantissa.split('.')[1]
+      precision = exponent + (mantissaDecimalPart?.length || 0)
+    }
+    else {
+      // Decimal notation: count decimal places
+      const decimalPart = str.split('.')[1]
+      precision = decimalPart?.length || 0
+    }
+    numStr = n.toFixed(precision)
+  }
+  else {
+    numStr = n.toString()
+  }
+
+  const parts = numStr.split('.')
   parts[0] = parts[0].replace(/\B(?=(\d{3})+(?!\d))/g, ',')
   return parts.join('.')
 }