diff --git a/DESCRIPTION b/DESCRIPTION
index 771a1ca..3d8ca98 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,7 +1,7 @@
 Package: flipChart
 Type: Package
 Title: Single function for calling charts - CChart
-Version: 1.12.11
+Version: 1.12.12
 Author: Displayr <opensource@displayr.com>
 Maintainer: Displayr <opensource@displayr.com>
 Description: Wrapper for other chart functions, such that they can be access via a
@@ -23,7 +23,7 @@ Imports:
     flipChartBasics,
     flipData (>= 1.2.7),
     flipFormat,
-    flipStandardCharts (>= 1.30.2),
+    flipStandardCharts (>= 1.32.12),
     flipStatistics,
     flipTables (>= 2.8.8),
     flipTime,
diff --git a/R/cchart.R b/R/cchart.R
index aec2f1c..03d6cf4 100644
--- a/R/cchart.R
+++ b/R/cchart.R
@@ -845,7 +845,7 @@ getPPTSettings <- function(chart.type, args, data)
             Crosses = categories.axis.line$crosses,
             MajorGridLine = list(Color = args$categories.grid.color,
             Width = px2pt(args$categories.grid.width),
-            Style = if (isTRUE(args$categories.grid.width == 0)) "None" else "Solid"),
+            Style = getGridLineStyle(args$categories.grid.width, args$categories.grid.dash)),
             RotateLabels = isTRUE(args$categories.tick.angle == 90),
             LabelPosition = "Low")
         if (any(nzchar(args$categories.bounds.maximum)))
@@ -866,7 +866,7 @@ getPPTSettings <- function(chart.type, args, data)
             Crosses = values.axis.line$crosses,
             MajorGridLine = list(Color = args$values.grid.color,
             Width = px2pt(args$values.grid.width),
-            Style = if (isTRUE(args$values.grid.width == 0)) "None" else "Solid"))
+            Style = getGridLineStyle(args$values.grid.width, args$values.grid.dash)))
         if (any(nzchar(args$values.bounds.maximum)))
             res$ValueAxis$Maximum <- args$values.bounds.maximum
         if (any(nzchar(args$values.bounds.minimum)))
@@ -934,6 +934,19 @@ getLineStyle <- function (line) {
     return (line$dash)
 }
 
+# Grid line style for PPT/Excel export. Unlike getLineStyle(), a missing width
+# does NOT mean "no line" here: getPPTSettings() sees the raw user args before
+# the chart-function defaults are applied, so an omitted grid.width just means
+# "use the chart default" (the grid is typically shown). Only an explicit width
+# of 0 hides the grid. isTRUE() keeps this NA-safe.
+getGridLineStyle <- function (width, dash) {
+    if (isTRUE(width == 0))
+        return ("None")
+    if (is.null(dash))
+        return ("Solid")
+    return (dash)
+}
+
 
 # Fix minimum axes bounds if they are not already set
 # This is performed only because PPT will set the minimum to 0 if not specified
diff --git a/tests/testthat/test-chartsettings.R b/tests/testthat/test-chartsettings.R
index d79dacf..c4248e3 100644
--- a/tests/testthat/test-chartsettings.R
+++ b/tests/testthat/test-chartsettings.R
@@ -341,3 +341,43 @@ test_that("Color opacity",
     expect_equal(attr(viz, "ChartSettings")$TemplateSeries[[3]]$OutlineColor, "#22222280")
     expect_equal(attr(viz, "ChartSettings")$TemplateSeries[[3]]$OutlineWidth, 1.500, tol = 1e-3)
 })
+
+test_that("Grid line type is exported to PowerPoint settings (RS-22447)",
+{
+    res <- suppressWarnings(CChart("Column", dat.1d, append.data = TRUE,
+            values.grid.width = 1, values.grid.dash = "Dot",
+            categories.grid.width = 1, categories.grid.dash = "Dash"))
+    expect_equal(attr(res, "ChartSettings")$ValueAxis$MajorGridLine$Style, "Dot")
+    expect_equal(attr(res, "ChartSettings")$PrimaryAxis$MajorGridLine$Style, "Dash")
+
+    # A zero-width grid is still "None" regardless of the dash setting.
+    res0 <- suppressWarnings(CChart("Column", dat.1d, append.data = TRUE,
+            values.grid.width = 0, values.grid.dash = "Dot"))
+    expect_equal(attr(res0, "ChartSettings")$ValueAxis$MajorGridLine$Style, "None")
+
+    # Backwards compatible: no dash supplied still exports as "Solid".
+    res1 <- suppressWarnings(CChart("Column", dat.1d, append.data = TRUE,
+            values.grid.width = 1))
+    expect_equal(attr(res1, "ChartSettings")$ValueAxis$MajorGridLine$Style, "Solid")
+
+    # Backwards compatible: grid.width omitted entirely (NULL in the raw user
+    # args seen by getPPTSettings) must keep the previous "Solid" default, not
+    # collapse to "None".
+    res2 <- suppressWarnings(CChart("Column", dat.1d, append.data = TRUE))
+    expect_equal(attr(res2, "ChartSettings")$ValueAxis$MajorGridLine$Style, "Solid")
+})
+
+test_that("getGridLineStyle handles missing/NA widths (RS-22447)",
+{
+    # Only an explicit width of 0 hides the grid.
+    expect_equal(getGridLineStyle(0, "Dot"), "None")
+    expect_equal(getGridLineStyle(0, NULL), "None")
+    # A visible grid uses the dash if given, otherwise "Solid".
+    expect_equal(getGridLineStyle(1, "Dash"), "Dash")
+    expect_equal(getGridLineStyle(1, NULL), "Solid")
+    # Missing/NA width must not hide the grid or error - it keeps "Solid"
+    # (the previous default) unless an explicit dash is supplied.
+    expect_equal(getGridLineStyle(NULL, NULL), "Solid")
+    expect_equal(getGridLineStyle(NA, NULL), "Solid")
+    expect_equal(getGridLineStyle(NULL, "Dot"), "Dot")
+})