diff --git a/DataProcessing/Program.cs b/DataProcessing/Program.cs
index 5656130..7bb4b0c 100644
--- a/DataProcessing/Program.cs
+++ b/DataProcessing/Program.cs
@@ -63,7 +63,10 @@ public static void Main()
                                         $"{VendorName} {QuiverCNBCDataDownloader.VendorDataName} data for date: {date:yyyy-MM-dd}");
                                 }
                             }
-                            instance.Flush();
+                            if (!instance.Flush())
+                            {
+                                return false;
+                            }
                             instance.ProcessUniverse();
                             return true;
                         });
@@ -138,7 +141,10 @@ public static void Main()
                                         $"{VendorName} {QuiverInsiderTradingDataDownloader.VendorDataName} data for date: {date:yyyy-MM-dd}");
                                 }
                             }
-                            instance.Flush();
+                            if (!instance.Flush())
+                            {
+                                return false;
+                            }
                             instance.ProcessUniverse();
                             return true;
                         });
diff --git a/DataProcessing/QuiverCNBCDataDownloader.cs b/DataProcessing/QuiverCNBCDataDownloader.cs
index e40032b..54295dc 100644
--- a/DataProcessing/QuiverCNBCDataDownloader.cs
+++ b/DataProcessing/QuiverCNBCDataDownloader.cs
@@ -141,6 +141,12 @@ public bool Run(DateTime processDate)
         /// <returns>True on success</returns>
         public bool Flush()
         {
+            if (_cnbcByTicker.Count == 0)
+            {
+                Log.Error($"QuiverCNBCDataDownloader.Flush(): No data accumulated; treating run as a failure (likely unable to reach QuiverQuant).");
+                return false;
+            }
+
             try
             {
                 foreach (var kvp in _cnbcByTicker)
diff --git a/DataProcessing/QuiverInsiderTradingDataDownloader.cs b/DataProcessing/QuiverInsiderTradingDataDownloader.cs
index f091c33..291a282 100644
--- a/DataProcessing/QuiverInsiderTradingDataDownloader.cs
+++ b/DataProcessing/QuiverInsiderTradingDataDownloader.cs
@@ -165,6 +165,12 @@ public bool Run(DateTime processDate)
         /// <returns>True on success</returns>
         public bool Flush()
         {
+            if (_insiderTradingByTicker.Count == 0)
+            {
+                Log.Error($"QuiverInsiderTradingDataDownloader.Flush(): No data accumulated; treating run as a failure (likely unable to reach QuiverQuant).");
+                return false;
+            }
+
             var failed = 0;
             foreach (var kvp in _insiderTradingByTicker)
             {