fix: null pointer exception when sync has not happened yet (#54)

Co-authored-by: DominicGBauer <[email protected]>

Author: DominicGBauer

core/src/commonMain/kotlin/com/powersync/db/PowerSyncDatabaseImpl.kt

@@ -301,15 +301,23 @@ internal class PowerSyncDatabaseImpl(
 
     private suspend fun updateHasSynced() {
         // Query the database to see if any data has been synced.
-        val timestamp = internalDb.getOptional("SELECT powersync_last_synced_at() as synced_at", null) { cursor ->
-            cursor.getString(0)!!
-        }
+        try {
+            val timestamp = internalDb.getOptional("SELECT powersync_last_synced_at() as synced_at", null) { cursor ->
+                cursor.getString(0)!!
+            }
 
-        val hasSynced = timestamp != null
-        if (hasSynced != currentStatus.hasSynced) {
-            val formattedDateTime = "${timestamp!!.replace(" ","T").toLocalDateTime()}Z"
-            val lastSyncedAt = Instant.parse(formattedDateTime)
-            currentStatus.update(hasSynced = hasSynced, lastSyncedAt = lastSyncedAt)
+            val hasSynced = timestamp != null
+            if (hasSynced != currentStatus.hasSynced) {
+                val formattedDateTime = "${timestamp!!.replace(" ","T").toLocalDateTime()}Z"
+                val lastSyncedAt = Instant.parse(formattedDateTime)
+                currentStatus.update(hasSynced = hasSynced, lastSyncedAt = lastSyncedAt)
+            }
+        } catch (e: Exception) {
+            if(e is NullPointerException) {
+                // No data has been synced which results in a null pointer exception
+                // and can be safely ignored.
+                return
+            }
         }
     }